Features: 1. Scope Of Use: Wide Range Of Places Such As Doors, Windows, Homes, Shops, Businesses, Etc. 2. The Product Is Small And Exquisite, Easy To Install, And The Provided Double Side Tape Can Be Easily Installed On The Door Or Window. 3. Just Stick The Main And Auxiliary Parts On The Door And Door Frame, Or Two Windows, And Align Them Leave A Gap Of About 5 Mm. 4. Once The Thief Smashes The Door, Smashes The Window, And Attempts To Steal The Main And Auxiliary Parts Are Separated, The Alarm Can Emit A Strong Alarm Sound To Scare Off The Thief And Remind The Owner And The Surrounding People To Catch The Thief. 5. When You Want To Open The Door And Window, You Can Control It By The Switch, It Is Suitable For Anti-Theft In Residential Houses, Offices, Store Counters, Etc. Installation Method: 1. Fix The Main Unit On The Door/Window With Double-Sided Tape; 2. Stick Another Bar-Shaped Door Sensor On The Door Frame Along The Prompt Line Of The Main Unit In A Straight Line; 3. When Checking The Settings, Turn The Main Switch To The "ON" Position; 4. Open The Door And See If The Siren Sounds From The Alarm. Specifications: Material: Silicone Size: 9.1cm/3.58in*3.1cm/1.22in*1.9cm/0.75in 1.4cm/0.55in*5cm/1.97in Color: As Shown Installation Method: Magnetic Control Alarm Sound 90 Decibels Use 2* AAA Batteries Need To Be Provided By Yourself Package Included: 1* Probe Host Without Batteries, 1* Door Sensor, 2* Double Side Tape.