Alarm Clocks reminders alarm nap drowsy alarm sound keep awake anti sleep

Features:
put it behind your right ear, alerts when the head lower in the degrees of 15 ° to 20 °.
Especially suitable for long-distance driving or night driving.
On / off switch driver safety alarm can help prevent accidents caused by driver's sleep when driving.
It is especially suitable for long-distance driving or night driving.
It is guardian angel for drivers.
Easy to use and comfortable to wear for a long time Features:
size :approx16*9cm
package included: 1pc anti-sleep alarm .