Detailed Product Description This is newest nap alarm. The product is an anti-drowsy alarm designed to raise drivers' awareness of momentary lapses caused by sleepiness and tiredness. Worn behind the right ear, it works on the principle of electronic balance. As the driver's head nods below a preset angle, the device omits a loud alarm signal alerting the driver to take corrective action (change drivers, take a break or take a nap).' This newest type focused on European market .It is more fit for European ear , And have the baffle to avoid you open the nap alarm in casual , flute on our nap alarm could fit for the driver which useing glasses . Rohs , CE, FCC , certificate . The product is not only designed for drivers, but is also perfect for people who need to be on full alert while on duty: security guards, machine operators, as well as students who need to work on their posture.