Features: Made of ABS plastic, strong and durable to use. It is powered by a 9V battery with low power consumption and long service life. Small and exquisite, easy to install, the double-sided adhesive provided can be easily installed on doors or windows. More than 120 Db high decibel alarm sound, really to deter the role of thieves. Can be installed in doors, windows, safe, garage, drawers, file cabinets, etc. Specifications: Wire length: 13cm/5.12" Product weight: about 59g Material: ABS plastic Power supply: a 9V battery (not included) Product color: white Scope: doors, windows, factories, companies, families, warehouses Size: 10*5*2.2cm/3.9*2.0*0.8in Package Weight: 69g/2.4oz Package List: 1 * Magnetic Sensor (Battery Not Included) 1 * Double-sided Adhesive 1 * User Manual Note: 1. Keep away from high temperature or fire source. 2. Do not soak or rain. 3. Please check the power supply regularly. 4. Do not disassemble or refit internal parts arbitrarily. Instructions for use: Small and exquisite, it is easy to install. The provided double-sided adhesive makes it easy to install the alarm on the door or window. Simply attach the primary and secondary attachments to the door and door frame, or two windows, and keep the auxiliary arrow aligned with the side mark of the main unit (leaving about 5mm gap). Once thief breaks the door or pries the window trying to steal (at this time, the separation distance of the main part and auxiliary unit is more than 10mm), the alarm will issue more than 120 dB alarm sound to scare thieves and to remind the owner and the people around the thief. When you want to open the door by yourself, it can be controlled by the switch (ON / OFF).