Fangrui Product Details Fangrui Product Details Fangrui Product Details 1. 4 In 1 Multi-function --- General Alarm, Constant Alarm, Closing-door Alert (time Delay), Doorbell 2. Batteried By 2pcs Aaa Batteries ( Not Included ). 3. Self-adhesive, Easy To Install And Operate. 4. 108 Db Loud Alarm Can Effectively Prevent Intruder Entering Through Your Door/window. 4 In 1 Multi-function: 1.general Alarm Mode It Alarms When Doors/windows Are Open; Stops When They Are Closed. 2. Constant Alarm Mode It Alarms At Least 30 Seconds When Triggered. 3. Time Delay Mode It Sounds Di-di-di When Doors/windows Opened 15 Seconds Later (can Set The Delay Time 3/15/30/60 Seconds, The Factory Default Is 15s). This Is For Freezers Or Refrigerators. Material: Abs Colour: White Package Contents: 1 X Door/window Alarm 1 X Magnetic Stripe Double Sided Sticker User Manual Only The Above Package Content, Other Products Are Not Included. Note: Light Shooting And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Err