Digital data transmission: Bluetooth smart

The R1 BLUE with Bluetooth® SMART technology supports devices with Bluetooth® SMART READY technology (also known as Bluetooth® 4.0 and previously Bluetooth® Low Energy technology). This enables the R1 BLUE to communicate with multiple smartphones, computers and sports devices.**

R1 Blue Comfortex +



R1 Blue Comfortex +

Compatible with many sports apps

All sport apps that support Bluetooth® SMART READY technology and use heart rate data can display the R1 BLUE’s values. Simply browse through the app stores to discover the many little aids for your everyday sporting activities. **

The R1 Heart Rate Sensor is compatible with the following Bluetooth-enabled iOS and Android devices:

iOS devices:
iPhone (4s and above), iPod touch (5th gen. and above), iPad (3rd gen. and above), iPad Mini, iPod Nano (7th gen. and above)

Android devices:
All devices with Bluetooth® SMART READY technology AND Android OS from version 4.3 As at: May 2014



ECG-accurate heart rate

For decades, SIGMA chest belts have been taking ECG-accurate heart rate measurements for our bike computers and sports watches. The new R1 BLUE expands the range to include a further product. The R1 BLUE ensures that every heart beat is recorded with utmost precision with a measuring range of 30 to 240 beats per minute.**

R1 Blue Comfortex +

Battery status


The R1 BLUE transmits the battery status. **

Battery life


Thanks to the energy-saving Bluetooth® SMART technology, the R1 BLUE’s battery lasts for approx. 1.3 years*



The R1 BLUE can withstand a static water pressure of 3 ATM for a limited period, making it ideal for many sporting activities.



Determining the heart rate variability

All cardiac muscle contractions are preceded by a wave of electrical excitation. In ECG, the clearest sign of excitation for a heartbeat is the R-wave, which is precisely what the R1 BLUE detects. The temporal gap between two heartbeats (R-waves) is known as the RR interval and differs in length. The R1 BLUE measures the RR interval in milliseconds and outputs this for heart rate variability (HRV) evaluations.**/***


R1 Blue Comfortex +


R1 Blue Comfortex +

Textile chest belt

The soft cloth composition of the COMFORTEX+ ensures a perfect, comfortable fit. Laminated electrodes require only slight dampening for a reliable heart rate measurement. It can be washed in the hand-wash cycle and the wash bag to 30 degrees.


* With a one-second transmission interval (default setting) and one hour of use per day.

** A ‘Bluetooth® SMART READY’ logo and/or an indication of an embedded Bluetooth® 4.0 module are required to communicate with Bluetooth® SMART devices. The operating system must also support Bluetooth® SMART READY technology. The latest Apple iOS, Mac OS and Windows 8 systems support Bluetooth® 4.0 technology. The latest android and Windows Phone 8 versions do not. As the operating systems undergo continual development, all technical details are subject to change. To use all the information provided by the R1 BLUE, this has to be supported by the application (e.g. a sports app). As development is continually ongoing, all details are subject to change. A list of devices that currently support Bluetooth® SMART READY technology can be found on the following website:

*** By evaluating the HRV during sport and at rest, conclusions can be drawn about the effort level and the recovery, for example. The HRV evaluation is not a feature offered by the R1 BLUE but by the Bluetooth® SMART READY device and its software.