1.Signal for immediate alarm when opening the door 2.Energy saving, power saving, and more worry free 3.Easy installation with double-sided stickers for immediate use, installation in place 4.Multiple triggering modes 5.Compact and portable, with richer application scenarios Battery model: 3 LR44 button batteries indicator light:Flashing indicator light during alarm Alarm sound: 100db-105dB Standby time: 5-6 months Multiple alarm modes: Four alarm modes Colour:White Material:ABS Package Contents: 1 x alarm 1 x magnetic strip Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.