"POSTURE TRAINER:Our updated posture corrector is equipped with a smart sensor, which 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! 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 its adjustable size. Dont hesitate to use this corrector for keeping good posture with your partner. EASY USB CHARGING:There is a USB charging cord in the box.Normally it can use 15 days(15 minutes/day) and you just charge it for about 2 hours. You can take it with you wherever you want to go.There are 4 levels lights in the display screen to show the battery power:1 star-25% power, 2 stars-50% power, 3 stars-75% power, 4 stars- power. Its very convenient to know the battery power directly by the lights. LIGHTWEIGHT FASHION 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. A 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. Keep using it as a posture trainer for at least 30 days and you will find you are in a good status. Enjoy healthy life with your family and friends! " Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.