Features: Magnetic sensor-switch detects entry protecting your home or office whether you are in or out Has a convenient ON/OFF switch, so you can set the alarm to OFF when you do Super-loud alarm. Super environmental suitability and stability Easily mounted by adhesive tapes, no other tools are needed, easy and quick installation Ideal entry warnings for homes, apartments, mobile homes, offices, hotel rooms, garages, and more Notice: *Actual color may be slightly different from the image due to different light effect *Please allow 1-3cm deviation due to manual measurement Description: Material: Plastic Color: White Loudness: 70-80dB Battery: 3 * 1.5V LR44 button cell built-in Alarm Unit: Approx. 3 * 6.2 * 2cm / 1.2 * 2.4 * 0.8inch Magnetic Sensor: Approx. 1.3 * 5.4cm / 0.5 * 2.1inch Package Included: 1 x Alarm Unit 1 x Magnetic Sensor Package List: 1xMagnetic Door Window Sensor Alarm Set