What you will get: 4 Contact Sensor Safe Alarm: This wireless chime alarm sensor will emit a volume of 120dB if your door or window are suddenly opened. It is a good helper for keeping the children, home, garage, school security Multi-function Modes: 1.Normal alarm mode---the alarm lasts for a minute when the door or window is opened (you can close the alarm with the remote control); 2.Alarm and stop mode---It will alarm when the door or window is opened, and will stop alarm once you close the door or window; 3.Doorbell mode---sound "Ding dong" to remind you when someone pushes the door to enter Long Range of 300ft Control: Our door alarm kit comes with a wireless remote control, you can use it to arm, disarm and control the door alarm. It also has SOS option, elderly can easily get help in an emergency Easy to Install: No wiring needed.Adhesive patches and screws come with the door alarm sensor Size: 9.1*3.1cm