Features1When the smart sensor monitors the angle, it will automatically trigger a vibration to remind the user to adjust to the correct posture. 2Help forming good posture habits, protecting eyesight and relieving back fatigue, easy and convenient to use. 3Real?time monitoring and automatic vibration alerts to remind the user to adjust and correct posture. 4When it detects that the user's hump is bent more than 20 degrees, it immediately activates a vibration alert. 5One?button operation, easy to use, suitable for both children and adult to use, designed with 3 gears strength.SpecificationItem Type: Posture ReminderMaterial: ABSBuilt-In Battery: Lithium battery 80mAhStrength: 3 Levels (high, middle and low)Level 3 (high): 8 vibration pulsesLevel 2 (middle): 5 vibration pulsesLevel 1 (low): 3 vibration pulsesUsage: 1. Stick one side of the adhesive tape on the back of the sitting posture correction reminder device, and stick the other side on the back of the human body (when lowering the head, about 5cm below a high convex point that appears at the level of the shoulder).2. After the machine is started, if there is no need to adjust the vibration pulse strength, the machine will immediately enter the standby state.When the body or head side bend more than 25 degrees, the machine automatically sends out the set vibration pulse strength, reminding to improve the sitting posture.3. According to their own needs to adjust the vibration pulse strength.4. After use, please take the sitting posture correction reminder off your back and turn it off.Please take good care of the sitting posture correction reminder device to prevent dust and other foreign matter from adhering to maintain the service life.Package List1 x Posture Reminder 1 x USB Cable 20 x Sticker