This alarm is wireless magnetic sensor, it will alarm with loud sound and light when the sensor detects someone come in, which can warn you and scare burglar away. It has a remote control with it, which has the functions of arm,disarm,emergency alarm and doorbell. It is widely used at home,office, shop,supermarket,school and other needed places. Features: 108dB high volume door window alarm with very loud siren in the compact body, effectively frighten the thieves. Magnet and vibration triggered alarm sounds when window or door is opened. It has the function of arm,disarm,emergency alarm and doorbell. It will alarm with loud sound and light when the sensor detects someone come in which can warn you and scare burglar away. Low-consumption design,which makes it can work long time. Comes with alarm and remote controller, a remote controller can control limitless magnetic door alarm, easy to operate. Practical home use product, tiny and fashion, 24 hours protection for your home, office, shop, supermarket, school, etc. Specification: Housing Material: ABS Alarm Color: White Alarm Mode: Vibration, Magnet Alarm Volume: 108dB(30cm tested) Communication Frequency: 433MHz(less disturbance than 315MHz) Installation Distance (Between Door Sensor & Magnetic Strip): ＜1cm Magnetic Door Alarm Power Supply: 2 * AAA alkaline batteries (NOT included) Remote Controller Power Supply: 1 * 27A alkaline battery (NOT included) Working Temperature: -10~60° Storage Temperature: -20~70° Alarm Size: 85 * 43 * 15mm/3.3 * 1.7 * 0.6in Remote Controller Size: 61 * 30 * 13mm/2.4 * 1.2 * 0.5in Magnet Strip Size: 50 * 10 * 12mm/2 * 0.4 * 0.5in Package Weight: approx. 72g/2.5oz Applicatiion: home, office, shop, supermarket, school, etc.(Only for indoor use) Package list: 1 * Magnetic Door Alarm(battery is NOT included) 1 * Remote Controller 1 * Magnetic Strip Note: Please allow small size error due to manual measurement. Thanks for your understanding.