Brand / CooSpo Material / Plastic Color / Black Compatible Devices / Tablet, Laptop, Smartphone Product Dimensions / 6 length x 3.5 width x 1.5 height cm Excellent Features: The H808S heart rate sensor can connect to smartphones, GPS watches, cycle computers, etc., to transfer exercise data. You can observe and record your real-time exercise heart rate thanks to improved sampling rates and wireless circuits, which have improved the accuracy and transmission speed of BPM monitoring. Wireless Heart Rate Sensor: The H808S heart rate sensor is equipped with both wireless Bluetooth and ANT+ technology, allowing it to pair with smartphones, cycle computers, etc. It supports sports apps such as Wahoo Fitness, RunKeeper, MapMyRun, Endomondo, and Sports Tracker. Convenient Indication Function: Through technological innovation, we have added a convenient indicator lamp that is not found in other companies' products. When the chest strap is properly tightened, the green lamp flashes and the sound "BLI" is heard. When paired successfully with an app wirelessly, the blue lamp flashes. It is more accurate and convenient than conventional products. Soft Chest Strap: The heart rate sensor strap is made of soft fabric. It is very breathable and does not feel hot even in summer. The size extends from 65 to 95 cm. (For long-term use of the chest strap, do not use chemical detergents when washing) Applicable Smartphone Models: Models that can be paired with the H808S heart rate sensor: iPhone 4s or later models with iOS 7.0 or later system versions. Also, Android 4.3 or later version models equipped with Bluetooth 4.0. If you have any problems or questions regarding pairing or the sensor itself, please contact us at any time. We will do our best to provide better products and services. *Box and instruction manual are not included. Please understand.