Two Controls Ways - Two pairs of wireless door open alarm and two remote controls can be synchronized with each other, allowing both doors and to be monitored. The unit can also be operated via the side buttons of the door alarm sensor Multipurpose - Can be used as a magnetic contact door alarm/door chime/pool door alarm/window alarm/refrigerator door alarm/pry door alarm/sliding door alarm Multiple Scenarios - Prevents burglars from entering, prying , preventing children from approaching cabinets, in-ground pools, preventing the elderly from lost, sleepwalking, etc. Easy Installation - The included double-sided stickers allow for wireless installation in one easy step. Sound 1 Loud Alarm - Deter intruders with a 120dB siren triggered by a high quality magnetic sensor Sound 2 Soft Chime - A relaxing chime reminds you that a door or window has been opened Note: The door sensor Without 2xAAA batteries,You need to prepare yourself Colour:White Material:plastic Package Contents: 2 set x Door Alarms 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.