Passage detector alarm, communication range of up to 100m (distance between the infrared receivers and the receiver). The range of the infrared receiver is 3-7 m. Notifies you in advance when guests (or intruders) arrive. Motion sensor alarm with 38 ringtones, you can choose the one(s) you prefer 3 levels of volume adjustment: High or Medium or Low. Receiver operating mode: single LED Light flashing or both sound and LED flashing. Power supply (receiver): AC 110-240V. Power supply (transmitter): 3 x 1.5V AAA batteries (not included) or 5 V DC adapters (not included) Applications: entrance alert, intrusion alarm, passageway alarm, bug detector, car alarm (indoor), warehouse monitor, power supply alarm closet, garage and tool shed monitor, mailbox sensor, front door or walkway detection. For different place to use Our alarm kit is ideal for use at home, office, factory, store or shopping mall. Wireless The sensor range is 3-7 meters vertically and a range angle of 110 degrees. With Ringtones There are 38 different ringtones. You can adjust it using the switch on the side of the receiver. And the volume can also be adjusted.