Features： 1、VIBRATION REMINDER: This intelligent strapless posture corrector could monitor your spine, if you get slouch, it will vibrate to remind you to get straight up. 2、POSTURE DETECTION: It is a intelligent strapless posture corrector, you could place it onto your upper back. Improve your posture and makes you look more healthy and elegant. 3、Removable: Removable, usb charging. It can remove and use the USB charge to keep it work. These daily training could help you to improve your posture. 4、PORTABLE: Convenient without pressure on the shoulder. It is a simplest, effective and most natural way to improve your posture. 5、DAILY TRAINING: Intelligent strapless posture corrector daily training could help you to improve your posture and built good habit gradually. Specification： Item Type: Posture corrector Material: ABS, silica gel Power Supply: Lithium ion battery (Built in) Battery Type: 602030 Battery Capacity: 200mAh Package List： 1 x Posture Corrector 1 x USB