Dynamic current: 105db It helps your well, and you don't need to worry about losing it 1pc x Remote Controller Please replace the battery once the alarm sound becomes lower Store temperature: -40℃~85℃ Effective remote control and alarm sensors 10m above the terminal, open area up to 30m Alarm: powered by 1x 6F22 9V battery (NOT included) Remote controller: powered by 1x L828 battery (Included) Please allow 0.5-1cm measuring deviation due to manual measurement. Please Take Out The Battery When Not Using The Alarm For A Long Time To Avoid Any Damage Due To The Leak Liquid. Effective Remote Control And Alarm Sensors 10m Above The Terminal, Open Area Up To 30m 2pcs X Screw Caps Using Method: The Red Button A, Fortification Will Beep; The B Button To Cancel The Gray, Will Beep . Alarm: Powered By 1x 6F22 9V Battery (NOT Included)