brand new and high quality Features: It is easy to Set Up Window/Door Sensor.Easily mounted by adhesive, just need to peel and stick.No screws needed, Included double sided tape.Save hunderds on Alarm Installation Cost. This is the excellent affordable compliment for your Home. Whether you are in or out,magnetic sensor switch to detect entry protecting your home or office . It can prevent a horrible accident from happening effectively.Keeping your children safe and knowing when they open doors. Super environmental suitability and stability, enjoying hard-wearing quality.ustproof and insect prevention,long service life of it.Perfect for various kind of occasion such home,office,store,warehouse, There is no need to worry about the states at all with this sensor. When someone opens the door or window illegally (the relative position of the primary and secondary parts changes), the alarm can issue alarm strongly, remind the owner and warning the intruder to leave. You can contact with us if you have any problem with it, we will do all we can do to solve your concerns. You can feel free to return or change the Door/ Window sensor if you don'for t satisfy with it,we will offer best serve for you. Specification: Sensor Type: Alarm Alarm Type: Sound Material: ABS Resin Host Size: 75x38X11.5mm/2.95x1.79x0.45inch Magnetic Stripe Size: 33x11.8x8.5mm/1.29x0.46x0.33inch Color: White Note: Please allow 0-1cm error due to manual measurement. Make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Contents: 1xPiece Magnetic Anti-theft Alarm.