Welcome

The Suunto Smart Heart Rate Belt 2 provides accurate heart rate (HR) and heartbeat interval, also called R-R interval, RRI, or HRV, data and running form measurements. We have taken great care to make this heart rate belt the most comfortable in the industry, by making it small, soft, and lightweight, without compromising accuracy.

The heart rate belt provides superior performance, especially in sports where hand movement disturbs wrist-based optical heart rate measurements and allows measuring heartrate while wearing the watch on top of the sleeve or attached to the bike handlebar, or even when not carrying the watch at all during the exercise.

The heartbeat interval measurement is the basis for all heart rate variability (HRV) based analysis like for example ZoneSense available in Suunto watches.

The Suunto Smart Heart Rate Belt 2 has a memory function that is used when the watch is not within reach of the Bluetooth Low Energy (BLE) connection of a Suunto watch. This is great for example in team sports and combat sports where the belt allows recording HR and R-R intervals without wearing the watch. The memory function also makes it possible to use the heart rate belt during swimming. The memory function is supported by all BLE enabled Suunto watches except Suunto 7 and Suunto Kailash. Most other BLE-enabled watches can connect to the heart rate belt and will receive high quality HR and R-R interval measurements but will not benefit from the memory function, nor from the running form measurements.

Biking, team sports, martial arts, climbing, swimming, water sports, triathlon, ski-mountaineering, cross-country skiing, skating, and gym enthusiasts will see the greatest benefits from using the Suunto Smart Heart Rate Belt 2 along with other endurance sport enthusiasts needing accurate analysis.

Safety

Types of safety precautions

Safety precautions

Getting started

After a few simple steps, you are ready to use your Suunto Smart Heart Rate Belt 2 to get accurate feedback about your exercise intensity.

Putting on belt

To start using the Suunto Smart Heart Rate Belt 2:

1. Snap the Suunto Smart module firmly into the chest strap.
2. Adjust the belt length as needed.
3. Moisten the electrode areas with water or electrode gel.
4. Put the belt on so that it fits tightly and the Suunto logo is facing the right way, LED facing up and button facing down.
   

The belt turns on automatically when it detects a skin contact.

Bluetooth traffic encryption

Suunto Smart Heart Rate Belt 2 will encrypt the BLE communication so that the transmission remains protected.

Pairing

You need to connect (pair) your Suunto Smart Heart Rate Belt 2 transmitter with a compatible BLE host to view your heart rate and other data produced by the heart rate belt.

The procedure to connect the heart rate belt is:

1. Wear the heart rate belt to power it on.
2. Initiate pairing in the host device.
3. Press the button for two seconds to accept the pairing request from the host. The host will be added to a known hosts list in the Suunto Smart Heart Rate Belt 2.
4. Check that the pairing was successful. If you are in an environment with many active BLE sensors you will want to check that the serial number of the found sensor is the same as on the back side of the transmitter of your heart rate belt. Suunto Smart Heart Rate Belt 2 will show up as SHRM2 followed by the last four digits of the serial number. After pairing you will see the battery level and the services available from the belt if the host device has this capability.
5. To pair a second and third host repeat the process from step 2 for each host. Suunto Smart Heart Rate Belt 2 can have an active connection to three hosts at the same time, but many more hosts can be on the known hosts list.

To initiate pairing in a Suunto watch go to the Connectivity menu inside the settings menu and choose Pair new device → Pair sensor or Pair HR sensor, depending on watch model. Remember to select the Suunto Smart Heart Rate Belt 2 into your relevant sports modes using the sport mode menu under the sports start wait screen.

The known hosts list

The Suunto Smart Heart Rate Belt 2 will accept connect requests from hosts, like sports watches, cycling computers, or mobile phones, without any user action if the host is on the known hosts list.

Pressing the button on the transmitter for 20 seconds results in a factory reset which clears the known hosts list. After the known hosts list has been cleared, hosts cannot anymore connect to Suunto Smart Heart Rate Belt 2 even if the host has the Smart Heart Rate Belt 2 in their list of paired Bluetooth sensors. Use the two-second button procedure described in the Pairing section to add hosts to the known hosts list.

LED behavior

The Suunto Smart Heart Rate Belt 2 has a three-color LED that indicates the functional state of the heart rate belt. These are the statuses indicated by the LED.

Software update through Suunto App

Suunto may offer software updates for the heart rate belt. To update the software, pair the heart rate belt with the Suunto App on an Android or iOS phone.

To pair the heart rate belt with the Suunto App, go to the device management area in the upper-left corner of the app's home screen, and then select the option to pair a heart rate belt.

Keep the heart rate belt connected to the Suunto App throughout the software download process.

Settings

After pairing the heart rate belt to the Suunto App a heart rate belt device screen will be accessible by pressing the heart rate icon on the top left of the home screen of Suunto App.

Settings will be available on the heart rate belt device screen.

• Power Save: Switch off the LED of the heart rate belt after three minutes so that the LED does not consume power during the workout. The default setting is Power Save ON.

• Running Form Measurement: If you are using a compatible Suunto watch you may want to switch on the running form measurement ON as it will give you insight on your running technique. The heart rate belt has inertia sensors for measuring the torso movement and algorithms that provide data based on this movement. This consumes battery so if you are not interested in running form data you may want to switch the running form measurement OFF. The default setting is Running Form OFF.

Using Suunto Smart Heart Rate Belt 2

Wearing and connecting the belt to get heart rate data

You can use your Suunto Smart Heart Rate Belt 2 to get accurate heart rate and heart beat interval measurements from any sport when using it with a compatible Suunto watch, and from most sports when used with some other host device.

Running form can be measured during running when Suunto Smart Heart Rate Belt 2 is used with a compatible Suunto watch.

To use your Suunto Smart Heart Rate Belt 2:

1. Put on your Suunto Smart Heart Rate Belt 2 (see Putting on belt).
2. Go to the workout start wait screen of the paired sports watch or other BLE enabled device and wait for an indication that heart rate is being received (see Pairing).
3. In the sport mode settings, enable the heart rate belt as the heart rate source, if needed, so that heart rate data is received from the belt rather than, for example, the optical wrist heart rate sensor. If multiple heart rate belts are paired with the watch, make sure the correct belt is selected for the sport mode.
4. Start your workout on the paired sports watch, or other paired BLE enabled device.
5. Complete your activity and then stop the workout.
6. Take off and rinse your heart rate belt well and then let it dry. Wash the strap part of the heart rate belt every few times of usage in a washing machine together with other sport clothes without fabric softener (see Handling guidelines).

Running form

For this function to work you will need a compatible Suunto Watch. See Suunto Smart Heart Rate Belt 2 product page on suunto.com for an up-to-date list of compatible watches. Examples of compatible watches are Suunto Race 2 and Suunto Vertical 2.

The Running form measurement function of the heart rate belt is based on six axis inertia sensors that measure the movement of the torso. This movement is used by algorithms to analyze the running form. See section 3.6 for switching the running form measurement on or off.

Suunto Race 2 and Vertical 2 and later watches in these series will switch this function on at the start of a running workout if Suunto Smart Heart Rate Belt 2 is chosen as a data source for Running form in the sensor management menu of the sport mode. At the end of the runnin workout these watches will switch off the running form function to save battery during the next workout.

Running form measurement provides the following data.

Memory function

You can record your heart rate and heartbeat interval data when swimming, doing team sports or combat sports, or in any activity where the use of a watch or smartphone is not convenient, or where radio transmission does not work.

To use the Suunto Smart Heart Rate Belt 2 memory function:

Use the belt and watch normally as described above but wait until the memory buffer of the heart rate belt has uploaded to the watch before stopping the workout. Otherwise, you will lose the content of the buffer. Modern Suunto watches will identify the situation and will not let you end the workout before the buffer has been uploaded to the watch.

The memory function is also used to buffer data whenever the heart rate signal from Suunto Smart Heart Rate Belt 2 to your Suunto sports watch is temporarily lost. Missing data is transferred as soon as the connection is restored without any need for user intervention. This can for example happen when the watch hand is on one side of the body and the transmitter of the heart rate belt is on the other side.

Care and support

Handling guidelines

Both the heart rate transmitter and chest strap of the Suunto Smart Heart Rate Belt 2 should be rinsed with fresh water after each use and allowed to dry frequently.

The chest strap should be machine washed in 30°C after every 2-3 exercises. See the belt tag for further washing instructions. Do not use fabric softener when washing! Sweat, salt, and dead skin cells build up will result in lost skin contact and skin irritation. Washing temperatures above 40°C may attach the dead skin cells to the electrode material resulting in a permanently weakened or lost skin contact.

Troubleshooting

The transmission range of the Suunto Smart Heart Rate Belt 2 can be up to ten meters.

However, for best results, minimize obstructions between the Suunto Smart Heart Rate Belt 2 and your sports watch, cycling computer, or mobile device. When not worn on wrist during a sports activity, keep the watch or mobile in front of you or to the side in a pocket or on a belt. The radio transmission will not pass through your body from one side to the other so keeping the watch in a backpack while in the open will break the radio signal.

If the Suunto Smart Heart Rate Belt 2 does not seem to be sending heart rate data even without obstructions, try any of the following:

1. Check if the LED starts flashing when putting on the heart rate belt.
2. Ensure the belt skin contact areas (electrodes) are wet and the Suunto logo of both the strap and transmitter is turned the correct way.
3. Adjust the belt so that it fits fairly tight against your chest.
4. If your skin tends to remain dry during a workout, use electrode gel.
5. Check that Bluetooth is on in the device your belt is paired with and that the correct heart rate belt has been paired and then selected for the workout.
6. Change the battery in the sensor.
7. Re-pair with your sports watch or mobile device.
8. Replace the strap.

If the Suunto Smart Heart Rate Belt 2 seems to send incorrect data, try any of the following:

1. Ensure that the transmitter is attached correctly to the belt with both snaps.
2. Pair the belt again with your BLE-enabled device.
3. Machine wash the chest strap in 30 ℃ without fabric softener.
4. Renew the chest strap.

Battery

The Suunto Smart Heart Rate Belt 2 uses a 3-Volt lithium cell (CR 2032).

To replace the battery:

1. Make sure no children are close before opening the battery cover of the transmitter.
2. Remove the transmitter from the chest strap.
3. Open the battery cover using the hook of the chest strap.
4. Replace the battery.
5. Firmly close the battery cover by pressing it shut. Check that the cover is rotated so that the shape matches the shape of the sensor.
6. Dispose of the used battery in a safe way, always following local recycling rules and keeping the battery out of reach of children.

Disposal

Please dispose of the transmitter in accordance with local regulations for electronic waste. Do not throw it in the garbage. If you wish, you may return the device to your nearest Suunto dealer.

Getting support

To get additional support, visit www.suunto.com/support. There you will find a comprehensive range of support materials, including Questions and Answers and instruction videos. You can also post questions directly to Suunto or email/call Suunto support professionals.

There are also many how-to videos on the Suunto YouTube channel at
www.youtube.com/user/MovesCountbySuunto.

We recommend registering your product to get the best personalized support from Suunto.

Reference

Technical specifications

Suunto Smart Heart Rate Belt 2 Transmitter

• Weight: 12.4 g / 0.437 oz (battery included)
• Diameter: 36.7 mm / 1.44 in
• Thickness: 8.6 mm / 0.335 in

• Operating temperature: 0°C to +55°C / 32°F to +131°F.

  TIP:

  Your body will keep the transmitter warm during winter sports so ambient temperature can be much lower.

• Storage temperature: -20°C to +55°C / −4°F to +131°F
• Water resistance: 30 m / 98 ft
• Battery type: CR2032
• Battery life: ~460 hours with only one active BLE connection, running form measurements turned off, and power save on. 210 hours with 3 concurrent BLE connections, running form turned on, and power save off.
• Transmission frequency: 2.4 GHz (Bluetooth Low Energy)

Suunto Chest Strap

• Weight: 31.2 g / 1.10 oz
• Width: 30 mm / 1.18 in
• Length: (see table below)
  

Radio transmitter

• Bluetooth 5.4 compatible
• Communication frequency: 2402-2480 MHz
• Maximum transmission power: < 0 dBm
• Range: 10 m / 14.6 ft, but in ideal conditions much longer.

Compliance

For compliance related information and detailed technical specifications, see “Product Safety and Regulatory Information” delivered together with your Suunto Smart Heart Rate Belt 2 and available at www.suunto.com/userguides.

CE

Hereby, Suunto Oy, declares that the radio equipment type SHRM2 is in compliance with Directive 2014/53/EU. The full text of the EU declaration of conformity is available at the following internet address: www.suunto.com/EUconformity.

Copyright

Copyright © Suunto Oy. All rights reserved. Suunto, Suunto product names, their logos and other Suunto brand trademarks and names are registered or unregistered trademarks of Suunto Oy. This document and its contents are proprietary to Suunto Oy and are intended solely for the use of clients to obtain knowledge and information regarding the operation of Suunto products. Its contents shall not be used or distributed for any other purpose and/or otherwise communicated, disclosed or reproduced without the prior written consent of Suunto Oy. While we have taken great care to ensure that information contained in this documentation is both comprehensive and accurate, no warranty of accuracy is expressed or implied. This document content is subject to change at any time without notice. The latest version of this documentation can be downloaded at www.suunto.com.