SHANREN Beat 20 Heart Rate Monitor [2019 Upgrade] ...
Specifications: Communication Mode: ANT+ / Bluetooth Smart Battery: Built-in Rechargeable Battery Working Time: 280hrsStrap Length: 65cm-95cm (25. 6-37. 4in)Sensor Size: 62*35*11mmWaterproof: IP68Weight: 55gApp Supports: Shiner Sport & Others IOS & Android Devices: IOS 7. 0 or later, Android 4. 3 or later Package List: 1 * Beat 20 Heart Rate Sensor1 * Adjustable Elastic Strap1
This is a very good product I have been using it for the past week, with ease. It is extremely user-friendly, easy to read and understand, lightweight. Comes with full instructions including good guide for use/misuse, it is pretty accurate, As to the seller: on-time delivery and the item just as described.