Feature: 1. Sensitive Anti Burglar Protection: The alarm has a strong door magnetic switch sensing ability, once triggered immediately audible alarm sound. Reliably protect your home from burglary. 2. Back Anti Tamper Design: When the transmitter is removed, the anti tamper button is triggered, the instant indicator flashes, and sends an alarm signal to the host. 3. Door Open Reminder: When the wireless door magnet is in the separated state, you can not go out, and the voice will remind you which door and window are not closed. 4. Multifunctional Application: In addition to home use, the door magnetic alarm is also suitable for stores, offices, warehouses and other places to provide you with a full range of security. 5. Easy Installation: The simple installation steps allow you to quickly use the door and window alarm which can be installed using both paste installation and screw installation. Specification: Item Type:Door Window Magnetic Sensor Alarm Material: ABSUses: Home, office, hotel, apartment, villa Transmission Frequency: 433MHz Launching Distance: ≤100 meters Battery Type: Lithium battery Battery Model: 12V 23A Battery Capacity: 50mAh (shipped with built-in battery). Package List: 1 x Alarm 1 x Magnetic Strip 1 x Alarm Spacer 1 x Magnetic Strip Spacer 2 x Screws