HR40 HEART RATE MONITOR & Endomondo Pair Chest strap︱ECG︱47g︱1200h ︱IPX7︱40-240BPM︱Bluetooth+ANT+ With comfortable fabric strap, and it's slim, light and ergonomically in design. Meanwhile, The battery lifetime is 340 hours. HR40 supports the connection with iGPSPORT bike computers or smart phones to sync real time heart rate data with iGPSPORT cloud platform for analyzing training data, checking training effect, managing training plan and maintaining a good training state. h