Wireless Door Infrared Alarm. Fits onto your shed, garage, barn door or window. For shed garage, security keypad alarm. Loud alarm signal: 110 dB siren. Adjustable security pin code operation. 3 x AA batteries required (not included). 3 settings: Instant, Delay & Chime. Instant Setting: 110 decibel siren sounds immediately until security code is entered. Delay Setting: 10-second delay to enter security code; 110 decibel siren sounds if code is not entered. Chime Setting: Alerts when door is opened; useful as a warning when a child opens the door. Code setup process: Set your own code by first pressing the unit's default code: "0000 + *". Then enter your new code, for example: "123 + *". To arm: press your code + *; red light turns on for 10 seconds. To disarm: press your code + * twice. Red light flashes for 10 seconds and unit turns off. Name: Alarm Working voltage: 4.5 V Application: Door and window anti-theft alarm Model: MM-1 Color: White Material: ABS Package Contents: 1 x Wireless Door Alarm (with installation hardware) Note: Light and display differences may cause slight color variation between image and actual item. Measurement error allowed: +/- 1-3 cm.