The Scosche RHYTHM armband pulse monitor uses no bulky chest straps or wires and easily attaches to your forearm for full wireless Bluetooth communication with your device. Control your favorite music from the integrated buttons while you workout. RHYTHM armband pulse monitor features a lightweight and comfortable armband, rechargeable battery (provides up to 6 hours of workout time) and the ability to wirelessly workout from up to 33 ft away from your device. The Scosche RHYTHM Fitness App works exclusively with the armband pulse monitor and other RHYTHM accessories to manage pulse rate, calories burned, distance, speed, pace, music and more. Accurately monitor your intensity level.