... by USB2.0 and fast. * The human body induction system, 120°angle of view,distance is about 5m.* With mounting ... and high power conversion rate, more than 90%* Powerful anti-jamming, it can work well even under the electromagnetism, electromagnetism ware ... .Record door chime,human body sensor chime Applicationsbell alarm,alarm system, human body sensor, door bell... Speeding alarm , vehicle speeding ...