Note: Delivered with built in battery specification: Item Type: Smart Pose Correction Wizard_x000D_Material: ABS_x000D_Battery Type: Lithium Battery_x000D_Battery Capacity: 600mAh (Shipped with Built In Battery)_x000D_Use Time: 50h_x000D_Charging Time: 1.5h_x000D_Communication Method: Low Energy BT 4.1 and Above_x000D_Temperature: -10~+55 Features: 1Real Time Monitoring: Real time monitoring of bad postures such as hunchback, high and low shoulders, etc. through smart sensors, which can effectively help improve bad habits and improve posture. 2Course Training: With interesting somatosensory exercises and professional posture training courses to help you actively develop good posture habits, improve your overall temperament, and increase your visual height. 3Solve the Root Cause Problem: Induction vibration reminds, straight shoulders autonomously, maintain the correct posture through the strength of one's own muscles, exercise the back muscles, and alleviate posture problems from the root cause. 4Real Time Reminder: Built in high accuracy motion sensor chip and intelligent posture recognition algorithm, accurately capture posture movements, real time posture reminder, posture correction in different scenarios such as sitting, bending, writing, standing, etc. 5Comfortable to Wear: No sense of wear, 62g lightness, as light and small as a BT headset. Fun interactive games, use a more fun way to urge yourself to move. PackageList: 1 x Smart Posture Correction Wizard 1 x USB Cable 1 x English Manual