Wireless Door Infrared Bell Alarm. Fits onto your shed, garage, barn door or window. For Shed Garage, Caravan Security Keypad Alarm. Loud alarm signal: 110 dB siren. Adjustable security pin code operation. 3 x AA battery operated (not supplied). 3 settings: Instant, Delay & Chime. Instant Setting: 110 decibel siren will sound immediately until security code is entered. Delay Setting: 10 second delay to enter security code before 110 decibel siren is sounded. Chime Setting: To alert you when a guest enters, or as a warning if a young person opens the door. Process for Code setups: Set your own code by first pressing the unit's default code: "0000 + *", Now enter your own code by pressing for example: "123 + *". To arm: press 123 + red light comes on for 10 seconds. To disarm: press 123 + TWICE!! Red light then flashes for 10 seconds and the unit is closed down. Name: Alarm Working voltage: 4.5 V Scope of application: door and window anti-theft alarm Model: MM-1 Color: White Material: ABS Package Contents: 1 x Wireless Door Alarm (with installing wire) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.