Sigma chest strap R1 blue Comfortex + with Bluetooth.
• Compatible with iPhone 4S, iPhone 5, iPad 3, iPad 4 and iPad mini (January 2013)
• Sends the following current values for devices with Bluetooth SMART READY technology
• ECG accurate heart rate
• RR intervals in milliseconds to determine the heart rate variability
• Battery Status
IPhone (4s and later), iPod touch (5th gen. And higher), iPad (3rd gen. And higher), iPad Mini, iPod Nano (7th and later).
All Bluetooth SMART READY and Android OS from version 4.3, October 2014.