Features: 1. New and high quality 2. Super loud 90 dB alarm 3. Convenience in installation--just peel and stick 4. Super environmental suitability and stability 5. Dustproof and insect prevention 6. Easily mounted by adhesive. Type to window or door. Ideal entry warning for homes apartments mobile homes do rms offices hotel rooms garages and more! 7. Magnetic sensor switch detects entry protecting your home or office whether you are in or out 8. Warning door / window sticker is supplied free in package 9. Operated by 3pcs of 1. 5V LR44 / AG 13 button cell ( included ) Specifications: 1.Sensor type: alarm 2.Alarm type: sound 3.Material: plastic 4.Color: White 5.Size: 2.5 x 1.3 x 0.8 inch Package Included: 10 x Magnetic Sensor 10 x Magnetic Stick 30 x LR44 Button Battery Entry Burglar Security Alarm Magnetic Sensor Alarm type: sound Material: plastic Color: White Size: 2.5 x 1.3 x 0.8 inch Sensor type: alarm