1. Charge anytime, anywhere: 48 hours of continuous use. Provide a convenient charging without any additional conditions. 2. Compatible with mainstream apps on the market, portable and , it is the best partner for photography. 3. Smart Wearable Design: Ergonomic ring design gives you a comfortable fit, the idea for her or his birthday, Valentine's Day, etc.. Product name: Bluetooth-compatible Self Timer Bluetooth-compatible version: V5.3 Bluetooth-compatible chip Input power: .DC-5V Battery capacity: 50 mAh Use time: continuous use for about 48h Support applications: support mainstream applications Product size: 37.3x18x32.9mm Colour:black Material:plastic Package Contents: 1 x Bluetooth-compatible Self Timer Only the above package content, other products are not included. Note: Light 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.