Features 1、POSTURE TRAINER: The updated posture corrector is equipped with a smart sensor, and has a new angle adjustment function, which can be adjusted by 5‑50 degrees, which is truly customized and will remind you by vibrating when you are in bad posture. You will develop muscle memory if you wear our posture corrector for a period of time. It means that even without the trainer device you will stay straight in the future. Be more confident in your life! 2、ADJUSTABLE SIZE:There is a durable adjustable buckle,which make it can be adjusted to the chest size ranging from 23’’ to 42’’. It fits adult (men and women) and kids because of its ultra‑high elasticity adjustable shoulder strap. 3、EASY USB CHARGING:There is a USB charging cord in the box. You just charge it for about 1.5 hours. You can take it with you wherever you want to go. 4、LIGHTWEIGHT DESIGN:The beautiful and lightweight design make it can be worn on your clothes at work or daily life inconspicuously. We recommend it for those who have humpback, sore shoulder, uncomfortable waist caused by long sitting at the desk. It is also a good choice for your children to keep good posture and health habit. 5、GOOD GIFT CHOICE:The universal size posture corrector can not only fit men and women,but also fit kids. It fits back spine, helps vertebra get back, pulls shoulders backward, prevent and improve humpback. Specification Material: ABS+PC+ high-strength nylon belt Host size: about 81*108*16.5mm Color: black/grey Size: One size (suitable for adults and children) Battery specification: 500mA/3.7V Charging current: 500mA Charging time: about 1.5 hours Charging interface: MINI-USB Android interface Charging voltage: 5V Packing method: color box Gift box size: about 85*115*70mm Package List 1* Posture Corrector 1* USB Charging Cable 1* English Manual