1.Advanced Connectivity: Equipped with both Bluetooth and ANT+ technology 2.The H303 Heart Rate Monitor ensures seamless compatibility with smartphones, bike computers, and sports watches. 3.Accurate Heart Rate Tracking: Experience precise heart rate monitoring during your cycling, running, or gym workouts 4.Comfortable & Adjustable: The included chest strap is soft, adjustable, and designed for comfort, even during extended training sessions. 5.Versatile Use: Ideal for a wide range of sports activities Chest strap size: 64-86cm (2cm) Chest strap type: integrated chest strap Battery model: CR2032 x 1(pre-installed in monitor) Wireless interface: Bluetooth 4.2, ANT+ Heart rate unit: BPM Heart rate accuracy: 1BPM Heart rate range: 30-240BPM Waterproof level: IP67 waterproof and dustproof Battery life: 1000h Colour:Black Material:Acrylic Package Contents: 1 x Heart Rate Monitor 1 x adjustable elastic strap Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.