... built-in. Adjustment volume.* Support downloaded by USB2.0 and fast. * The human body induction system, ... Audio frequency format: WAV* Audio rating output power: 0.5W (=8Ω d=1%* Frequency response: 2020KHz* ... 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, ...