Specifications: - Compatible with smartphones - Beurer Heart Rate Monitor PM 250 for use with Smartphones - The new PM 250 is perfectly suited for targeted training - The chest strap transfers the heart rate data via Bluetooth to your smartphone, where the Runtastic app keeps an extensive record of the values from your measurements Features: - The chest strap supplied with the Runtastic App for heart rate data Without additional adapter - 2 in 1: Bluetooth Smart and analogue signal transmission - Works on iPhone 4s and iPhone 5 - Android: Bluetooth Smart Ready devices from Android 4.3, Samsung Galaxy S4 - Electrocardiogram, accurate heart rate measurement - Individual training zone and alarm - Beurer - German engineering - 36 months warranty