MULTIFUNCTIONAL:Bluetooth/ANT + transmits your heart rate to your compatible device for instant feedback. Could provide you with accurate heartbeat data whether cycling, running, or doing sports. COMPATIBILITY:Bluetooth 4.0 and ANT compatibility allows heart rate sensor to connect to smartphones and tablets, as well as GPS watches by Garmin, Polar, Wahoo, and more. It works with iPhone 4S and later, and with select Android devices using Android 4.3. PERFECT DESIGN: IPX67 level water-resistant.Soft, adjustable textile chest strap with improved electrodes and button holes for comfort and safety during exercise. BATTERY LIFE: Ultra-long battery life, the using time of a CR2032 battery can be about 800 hours and replaceable. Comfortable chest belt Strap length adjustable. GUARANTEE: If you are not satisfied with our product received, you can apply for unconditional return and refund within 30 days. In terms of any problem of this product, you can send emails to us at any time. We will reply you as soon.