<b>SPECIFICATION:</b> <p>Charging interface: Standard USB interface</p> <p>Battery Capacity: 400mAH/3.7V</p> <p>Power Supply: 5V</p> <p>Power consumption: 0.4W</p> <p>Charging Time: Approximate 1.5 hours</p> <p>Charging Voltage: 5V</p> <p>Net Weight: 85g</p> <p>Material: ABS+ High strength elastic nylon belt</p> <p>Range of Application: 15kg-95kg</p> <b>PACKAGING LIST:</b> <p>User manual*1</p> <p>Posture corrector*1</p> <p>USB charging cable*1</p> <b>OPERATION:</b> <p>1. First adjust the strap to the appropriate length.</p> <p>2. Hold the switch for 1 second to power on the reminder, there will light up and vibrate 1 time, which means it is working normally.</p> <p>3. when you have back bow or hunchback exceed 25 degrees, it can reminder you by vibration to keep your chest straight and records the number of times plus 1 automatically on LED display.</p> <b>NOTE:</b> <p>1. For the first couple of days, we recommend wearing it 10 minutes per day to get used to it. Gradually increase that over time and wear it 2 hours per day. There typically see positive at least 21 days, and 90 days to stable the good habit.</p> <p>2. Don't use it when you're sleeping or it’s charging .</p> <p>3. Discuss with your doctor for using when you're hospitalized.</p> <p>4. Stop using it when you feel unwell.</p>