... it will alarm 2.helps driver stay awake to avoid dangerous 3.nap zapper ,nap alarm,driveway alarm Drive alert nap zapper alarm,quake alarm,driveway alarm anti-sleep alarm for on ... Alarm Alarm mode: Beep Dimensions: 75 x 22 x 15mm Angle of Protection: 15~ 30 Life time: 3,500nods * 3 = 10,500nods for driver help nap alarm ...