Sensor: Get yourself a posture corrector back sensor! Counting: What's more, this device even records the number of times a day you sit in the wrong posture, making it easy to reduce the amount of times you lean over. Colours: Choose from two colours: black or grey. Posture: Improve your posture by attaching this sensor onto your back. It vibrates whenever you're sitting in the incorrect posture. Easy to use: It's easy to put on and turn on! Press and hold the switch for one second to turn on the vibration. Versatile: This handy gadget is perfect for children and adults alike! Posture Corrector Back Sensor | Black | Living Social