Mini Door and Window Alarm, Lingsfire 6pcs Mini Wireless Window Alarm, radio alarm, door alarm, home security sensor alarm system for windows, doors and cabinets (Batteries Included) Easy to install and requires no wiring Window/door alarms feature easy access off/alarm switch Low battery test button to check battery life Alarm Sound: &gt; 90dB After-sale Service: The products can be returned and exchanged within 90 days