Test/Hush Button,120V/220VAC power supply,9V back-up battery,85dB/3m,Wireless interconnection,meets EN14604,UL217 Test by hand,Low battery warningHush ButtonLow standby current,Auto reset,ASIC adopted Anti-light, mothproof,Strong adaptability for circumstance SMT design, high stabilityOperating Voltage:120V/220V ACBackup Battery: 9V battery Static current: ≤10uA Alarm current: ≤15mA Alarm ...