Description: Wide usage: This window alarm is suitable for both window and door, and is convenient to install and use. Loud alarm: This window open close detector's alert sound is up to 105dB, so it can easily remind peoples that someone open the window. Convenient to install: This window alarm can be easily mounted on a door or window by using some double sided tapes. Applicable place: This door alarm is a nice choice to be used in a living room, bedroom, garage, warehouse, apartment, dorm, etc. Battery powered: This window open close alarm is powered by button cells, and the change of the cells is rather convenient and simple. Specification: Material: Plastic. Color: Show as picture. Size(LxWxH): Approx. 53x35x20mm/2.09x1.38x0.79 inch. Battery: 3x AG13 batteries(included). Volume: 105dB. Note: There might be a bit of color distortions due to different computer resolutions. There might be a slight error due to different hand measurements. Package Includes: 1 Piece Window Alarm.