... pulse circumstance* Operating voltage: DC4.5V* Audio frequency format: WAV* Audio rating output power: 0.5W (=8Ω d ... sensor chime Applicationsbell alarm,alarm system, human body sensor, door bell... Speeding alarm , vehicle speeding alarm , overspeed alarm , ... ,anti-theft alarm ,security alarm ,security system, bell, chime, door chime, recording voice chime high quality recordable wireless door bell