1) To ensure driving safety and to avoid traffic accidents caused by sleepless. When the forehead rocks or the nod shakes, the nap alarm can utter the sound 2) The nap zapper is not only designed for drivers, it is perfect for people who need to be full alert while on duty such as security guards, machine Operators, who need to work on their posture 3) It can also be worn by the students to protect from being near sighted 4) The alarm is designed to keep you awake until you get where you are Going, and to alert you to your drowsiness so that you can take Corrective actions 5) Time for use: Long-distance driving, drunk driving, night driving Outer packing: 420pcs/ctn Carton dimensions: 67 x 46 x 41cm N. W.: 15.5kg G. W.: 16.5kg Conveyance: Qty/20' FCL: 137,658pcs Qty/40' FCL: 256,329pcs