This is the Night Shift Sleep Positioner: an iPhone/Android compatible sleep apnea therapy solution that uses vibration feedback to keep you off your back, so you snore less and sleep better. You simply have to wear this around your neck in bed. When you start sleeping on your back, the device starts to vibrate. The vibration increases in intensity until you change position.
Night Shift combines with your phone to track sleep quality. Its portal/app also lets you download reports and adjust device settings. The device has a 200mAh rechargeable battery.[where to get it]