1-200PCS WIRELESS Home Window Door Burglar Security ALARM System Magnetic Sensor Descriptions: 1.100% Brand New and High Quality 2.Magnetic sensor switch detects entry 3.Ideal guardian against the unwanted intruder whether you are in or out, keep yourself and your property safe and security 4.Easily attach the main sensor on the door/window and attach the stick adjacent the main sensor on the door/window frame with the adhesive tape (included) 5.Handy ON/OFF switch: in the state of "ON", the sensor will emit the alarm signal as long as someone opens your door or window 6.Super loud 90 dB alarm 7.Powered by 3*1.5V LR44 button cell 8.siren Loudness:90db Features: 💙 Easily mounted by adhesive tape to window or door. 💙 Magnetic sensor switch detects entry protecting your home or office whether you are in or out. 💙 Warning door/window sticker is supplied free in package. 💙 Operating by 3 pcs.1.5VLR44 button cell. Operating instructions: 1.Use the double-side adhesive tape to fix the main unit at the side of the door/window.Attach the bar magnet to door frame/window frame with the arrow aligning with the refrence line of the main unit. 2.Test the setup by swithing the system's switch to ''ON'' position of the main unit and see whether the alarm can be triggered by opening the door/window. Package includes: 1/2/3/4/5....../200x Magnetic Sensor Feedback:1) Your Feedback is really important to us,please take a few seconds to leave great feedback if you are satisfied with our product or service, thank you so much!2) We always offer the lowest price for best goods and service to you. 3) Please contact us before leaving neutral(3 stars) or negative(1-2 stars) feedback.We will try our best to solve the problem and leave you a happy shopping mood here. Thank you!