Ideal for detecting visitors and crime prevention: The door open/close sensor, as an automatic notification chime for the entrance of businesses and stores, it can also be used as an intrusion check sensor chime to prevent suspicious and thieves. When the door or window is open, it senses and sounds chime.
Easy Installation: The magnet sensor is battery operated, so no wiring is required. With double-sided adhesive tape, you can attach it freely to your front door or living room window. Note: The maximum installation gap should not exceed 0.4 inches (1 cm).
LOUD & 4 MODES: 1. Siren: When you open the door or window, the magnet sensor detects loud alarm sounds (up to 1200 dB) and will continue to sound unless the switch is turned off. 2. Door opening presentation: When you open the door, the doorbell will sound a warning sound and will only ring one time. 3. Door opening siren: When you open the door or window, the magnet sensor detects the loud alarm sound (up to 1200 dB) will continue to sound unless the switch is turned off. 4. Door close suggestion: After the door is opened, the "didi" volume will be repeatedly from small to large until the door sensor and magnetic strip closed.
Compact Size & Eco Material: Product Size: 3.9 x 1.2 x 0.6 inches (100 x 30 x 15 mm), Magnet Size: 1.8 x 0.6 inches (45 x 8 x 15 mm), Material: ABS, Power Supply: 2 AAA batteries (sold separately).