Detailed Product Description Voice Prompt With Sensor (WT6120F10) Features * Loop and support ... 120°angle of view,distance is about 5m.* With mounting bracket, 180°adjustable angle sensor.* Power supply ... sensor chime Applicationsbell alarm,alarm system, human body sensor, door bell... Speeding alarm , vehicle speeding alarm , overspeed alarm , alarm ,anti-theft alarm ,security alarm ,security system, ...