Unisex Fitness Tracker Watch Smart Bracelet Blood Pressure Heart Rate Monitor Waterproof Smart Band Friendly Tips: 1. Please kindly allow 2-3% difference according to manual measurement. 2. Please check the measurement chart carefully before you buy the item (inch = 2.54 cm). 3. Please note that slight color difference should be acceptable due to the light and screen. Thanks. Specification: Battery capacity: 150 mAh Product weight:46g Memory:16mb How to wea:Wristband Mode of operation:Touch Package Contents: 1* Smart bracelet 1* User manual Promise If the product has any quality problems, please feel free to contact us, we will help you solve the problem as quickly as possible.