Detailed Product Description Sensor alarm, door bell, chime, record bell, voice alarmWT6120F10 Features* Not just a door bell* Light sensitive ... Operating current: 120mA* Audio output0.5W/8Ω mono * Sensor distance≤5m * Use 3 pcs AA battery . * Outside ... sound when the light changed . Speeding alarm , vehicle speeding alarm , overspeed alarm , alarm ,anti-theft alarm ,security alarm ,security system .