SIGMA chest strap R1 Duo Comfortex+

Pulse transmitter using energy-saving Bluetooth® SMART technology. This allows the use of new generation smartphones during training.

Compatibility:

• Bluetooth 4.0 and Bluetooth® SMART READY technology required (also Bluetooth® 4.0 and Bluetooth® Low
  Energy technology
• iPhone (5 and later)
• phones with Android from version 4.3
• ROX 10, ROX 11 with other computer counters with ANT +
  
  

Characteristics:

• lightweight, flexible adjustable strap
• laminated electrodes for better and more accurate pulse measurement
• measurement from 30 to 240 beats per minute
• the band sends information about the battery status to the application
• battery life up to 1.3 years (set to measure every 1 sec, for 1 hour of training per day)
• water resistance up to 3 ATM
• measures the RR interval in milliseconds, which is a measure of heart rate variability
• ANT + speed sensor