Easily mounted by adhesive tape to window or door. Magnetic sensor switch detects entry protecting your home or office where you are in or out,suitable for families, apartments, mobile homes, apartments, office buildings, hotel rooms, garages,the ideal entrance warning!_x000D__x000D_Features:_x000D__x000D_Easily mounted by adhesive, just need to peel and stick. _x000D_Super loud 90 dB alarm, you will not miss it. _x000D_Super environmental suitability and stability, enjoying hard-wearing quality. _x000D_Dustproof and insect prevention,long service life of it. _x000D_Magnetic sensor switch to detect entry protecting your home or office whether you are in or out. _x000D_Warning door / window sticker is supplied free in package. _x000D_Operated by 3pcs of 1. 5V LR44 / AG 13 button cell ( included ), ultra-long standby. _x000D__x000D_Specifications:_x000D_Sensor Type: Alarm_x000D_Alarm Type: Sound_x000D_Material: Plastic_x000D_Color: White_x000D_Size (L * W * H): 6.5 * 3.1 * 2cm / 2.6 * 1.2 * 0.8in_x000D_Package Weight: 34g / 1.2oz_x000D__x000D_Package List:_x000D_1 * Magnetic Sensor_x000D_1 * Magnetic Bar_x000D_3 * LR44 button batteries 1Easily mounted by adhesive, just need to peel and stick. 2Super loud 90 dB alarm, you will not miss it. 3Magnetic sensor switch to detect entry protecting your home or office whether you are in or out. 4Super environmental suitability and stability, enjoying hard?wearing quality. 5Dustproof and insect prevention,long service life of it.1 *MagneticSensor 1 *MagneticBar 3 * LR44buttonbatteries