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Using1. The device has a little lever switch, move it to the ON side. 2. Test that it is working properly by tilting it forward, if it beeps then it is at working state 3. Place behind your ear and adjust, it should be placed correctly for effectiveness...

About the product1. Brand new and high quality. 2. It beeps when you down your head to help you wake up. 3. Can protect you from the possible tragedy involved in falling asleep behind the wheel 4. Ensures driving safety and to avoid traffic accidents...