6 Packs!! x Window Door Security AlarmLow Price and High Quality Security System1. Super loud 90 dB alarm2. Warning door / window sticker is supplied free in package3. 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!4. Super environmental suitability and stability5. Dustproof and insect prevention6. Convenience in installation--just peel and stick7. Magnetic sensor switch detects entry protecting your home or office whether you are in or out8. Operated by 3pcs of. 5VLR44 / AG 13 button cell ( included )Specifications:1.Sensor type: alarm2.Alarm type: sound3.Material: plastic4.Color: White5.Size: 6.2cm x 3.2cm x 2cmWhat's in the Pack?6 x Magnetic Sensor6 x Magnetic Stick18 x LR44 Button Battery ( in the sensor )