Details introductions: this style can be used in the door, window, drawer and coffer etc. when somebody illegally open the door and window ,it will give out harsh alarm voice to stop and scared the theft. Specifications parameters: working power supply: one AG23 type 12V battery Static current: ＜4μA The working current: 13-15mA Communication command: rolling digital command Battery life: about a year Built-in two sensors: magnetic plate wired signals access : closed signal Appearance dimensions:38 mm×65 mm×18 mm