The item is a simple and practical wireless entry security alarm, which adopts magnetic sensor to detect entry protection your home or office whether you are , and can be easily mounted to or doors with the included double-sided adhesive tape, no any tools required. Besides, this window door entry alarm with a handy ON/OFF . In the state of "ON", the sensor will the alarm signal as long as someone opens your door or window further than 1cm around. With compact size and easy to use, it is really a wonderful door window entry alarm for choice. Features - ColorWhite - Shell material: durable hard plastic. - and Wireless Magnetic Sensor Door Window Entry Safety Security Alarm Bell. - This extremely 90dB loud sound Wireless Door Alarm is an guardian against the unwanted . - Magnetic sensor detects entry protecting your home or office whether you are . - Easily mounted to or doors with included double-sided adhesive tape, no any tools required. - Come with a handy ON/OFF . In the state of "ON", the sensor will the alarm signal as long as someone opens your door or window further than 1cm around. - Powered by 3 * button cells (included). - Compact size and light weight for convenient you to take it with on business trips and vacations, keep yourself and your property safe and security. - entry warning for homes, apartments, , offices, and more! Package list: 1 * Wireless Magnetic Sensor Door Window Entry Safety Security Alarm Bell for Home /Office (White)