Silicone Invisible Posture Corrector Anti-Humpback Male Ladies Adult Children Portable Posture Correction Device Protect Eyesight Office Home Walk USB Charging Type 1 Features: 1. Made of food-grade silicone material, it is lightweight and durable, soft and skin-friendly, not easy to deform, fits the human body curve, and is comfortable to wear. 2. The built-in high-precision chip can accurately record the posture, monitor the change of the body inclination angle in real time, and vibrate to remind. 3. The automatic memory function can intelligently sense incorrect posture, monitor posture in real time, and scientifically and effectively help you correct unhealthy postures such as hunchback. 4. Helps correct wrong body posture of the back and shoulders, improve hunchback, develop correct body posture, protect eyesight, and reshape beautiful curves. 5. It is suitable for a variety of occasions, such as work, study, walking, reading, etc., and fundamentally help you solve postural problems.  Specifications: Material: Food grade silicone + imported ABS Color: black Size: 18.5*14.5*2CM Weight: 90g Packing size: 18*14*3CM Rated input: 5V/1A Battery life: about 1 week (wearing 4 hours a day) Rated power: 0.4W Battery capacity: 200mAh/3.7V  Packing List: 1* Posture Corrector 1* USB Charging Cable 1* English User Manual Type 2 Features: 1. Using a three-axis position sensor, the Al algorithm accurately recognizes and correct the wearer'sposture. 2. When a bad posture of the wearer is detected, it will vibrate to remind. 3. You can freely set theanglefrom 5 to 50 degrees according to your age and physical condition. 4. The count of bad postures will be recorded. The Flash main control chip has a memoryfunction, and the data will not be lost when the battery is exhausted or turn off. 5. The elastic strap adopts a movable buckle design,hasstrong adhesive forceand super flexibility,easy to adjust and not easy to fall off, better fittingthe body. Specifications: Material: ABS+PC+ Nylon Size: 110*80*15mm Weight: 80g Input: 5V/1A Charging Time: About 1.5 hours Charging Interface: MICROUSB Battery: 500mAh Packing list: 1* Unisex Back Trainer 1* USB Charger Cord 1* User Manual