Would you like transmit your heart rate to your smartphone during exercise and evaluate the results? Then the SPM 230 is your ideal training partner. Transmit the recorded values to your fitness app via Bluetooth® Smart. Thanks to the analogue signal transmission, the device is also compatible with most training devices in the fitness studio and with heart rate monitors with analogue signal transmission Heart rate measurement with smartphones: compatible with the most popular fitness apps available from January 2-in-1: Bluetooth® Smart + analogue signal transmission Accurate ECG heart rate measurement Features such as the individual training range, alarm, average and max. heart rate, calorie consumption (kcal) etc. depend on the app used Navigation, speed and route recording with your smartphone Splash-proof (splashes/perspiration) Incl. 1 x 3V CR2032 battery Compatible with iPhone 5s/5c/5/4s and Bluetooth® Smart-ready Android™ devices from Android 4.3.