Sigma R1 Blue Comfortex+ heart rate monitor Black, Blue

The new R1 BLUE transmitter from SIGMA SPORT transmits the heart rate via energy-saving Bluetooth® SMART technology. This enables the R1 BLUE to communicate with multiple smartphones, computers and sports devices. All sport apps that support Bluetooth® SMART READY technology and use heart rate data can display the R1 BLUE’s values.

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.

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.

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.

Battery status

The R1 BLUE transmits the battery status.

Battery life of over 1.3 years

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

Battery compartment

The battery compartment can be simply opened using a coin, making it easy to independently replace the standard CR 2032 button cell battery.

Waterproof to 3 ATM

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

RR intervals in milliseconds for 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.