StarryBay? High Sensitivity Sensor Alarm Infrared Wireless Home Alarm Security Systems with Remote Controller 1.Impressive Coverage Area - 110 Degrees Wide Angle Detection to cover a large area even to the small zone. 2. Standalone alarm. No need to connect to a main console. You can also mix and match from different similar companies based on your needs. 50 sensors can be added up to to this unit which work independently of one another. 3. 108 dB loud Alert to keep you informed of the home security.It helps deter intruders and dangerous threats you may encounter while on the go with 30 seconds alarming. 4. No external wires, pretty easy set-up. You just put in a few batteries in the device and then hook it up on windows, doors or walls. The screw to hold the main part to the door/frame, and a double sided adhesive tape to stick to windows. 5. Suitable as an entry-level alarm for home,apartment or small business which doesn't take up a lot of space. One Simply installation keeps unsafe factor away with the affordable cost.