Real-Time Monitoring,Accurate Capture OfHeart Rate Data PhotoelectricDual-beam Monitor Supports connection to standard ANT+ or Bluetooth protocol devices such as smartphones, cycling computers, , treadmills, rowers, and other equipment This device supports heart rate data measurement. You can mit the heart rate data to fitness equipment or sports apps through ANT+ or Bluetooth protocols. IP67 sweat and water resistance means that the HS800 optical armband heart rate monitor has the same excellent precision performance in both dry and wet conditions 45h continuous working time to meet your long training needs. Magnetic charging that is convenient and fast while charging Product name:HS800 Optical Armband Heart Rate Monitor Heart rate accuracy:1±BPM Heart rate range:40-220BPM Battery life:45h Wireless protocol:Bluetooth, ANT+ Charging method:Magnetic charging Sensor size:44 x 31 x 11mm Armband size:37 x 2.5cm Armband adjustment range:19.5-30.5cm Armband cleaning advice:Gentle hand wash Color: Black Material: Plastic cloth Package Contents: 1 * Sensor 1 * elastic armband 1 * Magnetic charging cable 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.