It has two Yale alarms . It has a key which controls the alarm which you can turn the alarm on and of . It has two stickers which you can put around the house to warn others you have an alarm .it has four sensors which warns you if there is movement in the house . There are two door/window sensors (you can put them on the door or window ) . There is one main control and one instruction book . It has only been in use for a couple of months . It all works perfectly .