BluetoothR SMART READY chest belt for ECG accurate heart rate measurements for SPORT APPs. The new R1 BLUE transmitter from SIGMA SPORT transmits the heart rate via energy saving BluetoothR SMART technology. This enables the R1 BLUE to communicate with multiple smartphones, computers and sports devices. All sport apps that support BluetoothR SMART READY technology and use heart rate data can display the R1 BLUEs values. Compatible with the iphone 4s 5, iPod touch 5th generation, iPad3rd 4th generation, as at January 2013. Transmits the following up to date values to devices with Bluetooth SMART READY technology ECG accurate heart rate, RR intervals in milliseconds for determining the heart rate variability battery status. The textile chest belt can be washed on a hand wash cycle.