Features Specifications:Sell nap alarm / nap zapper  nap alarm / nap zapper The Nap zapper is the guardian angel for drivers  This product can protect you and your passengers from accidents due to drowsiness The Nap zapper is worn over the ear and has an electronic position sensor When your head nods forward, it sounds a loud alarm/vibration to instantly awake you and alert your passengers This is ideal for students burning the candle at both ends, or for drivers on long stretches of boring road that you know too well Also security guards, machine operators, or even those watching telly and wanting to maintain correct Weight: 15g Size: Length: 70mm  Width: 60mm  Thickness: 15mm  o Colors: black and blue  o Power: LR14 (1.5V x 3) battery  o Remark: with 9 pieces batteries totally, while 6 pieces of batteries attached in additionally  o Alarm angle: 15 to 30 degrees(adjustable)  85DB  o Patent: applied for design registration (E0610158E)  o Certification: CE