4 PCS Door Window Magnetic Sensor Anti-entry Security Alarm

Features1. The door and window alarm can effectively stop the intruder/thief with 120dB loud alarm 2. Multi-function: You can set the appropriate according to your needs. 3. Easy to install: This product is easy to install, just paste the main unit on the door frame and paste the auxiliary machine on the door, or two windows, the arrows of the auxiliary machine are aligned with the side markings on the main machine. 4. Magnetic type door alarm sensor: suitable for doors, windows, sliding doors and windows, freezers and refrigerators.Specifications1. Voltage: 4.5V 2. Current: 60mA 3. Volume: 120dB 4. Power supply: LR44 x 3