Features11000H long battery life, IP67 waterproof grade, realtime heart rate. 2Scientific exercise, accurate data synchronization, quantitative analysis of status, and timely adjustment. 3Switchfree design, comfortable and portable to wear. 4ANT+/Bluetooth connection, simple operation, convenient and practical. 5Professional manufacturing, stable performance and high reliability.SpecificationItem type: BluetoothChestStrap Material:Neoprene+PVCColor: blackAdjustablel Size: Approx. 64-86cm/25.2-33.9in(adjustable)Weight: Approx. 70gBuilt-in battery: CR2032 batteryBattery capacity: 220mahRechargeable: NoLife time: about 1000HConnection method: ANT +/BluetoothWaterproof rating: IP67Applicable people: men and women are not limitedPurpose: outdoor/cycling/competitive sportsFunction: Heart rate monitoringPackage List1 x Sensor1 x Adjustable elastic belt1 x Instruction