1、Multiple Choice: There are 36 chimes options and 4 adjustable volume levels to choose from. A variety of ringtones can be selected according to your preferences, the volume can be adjusted to meet different space needs, suitable for most rooms. 2、Large Coverage Area: Light and sensitive, the receiver LED flashing warning. Open area operation range up to 1000 feet, strong penetration, ensure you hear the bell and open the door in time. 3、Easy to Install: The receiver is plug in mounted, and the transmitter is powered by a 23A 12V battery (included). Install the transmitter at the outdoor door. Your guests only need to press it, and you will immediately hear the doorbell while you are busy indoors. 4、ABS Material: This wireless doorbell is made of premium ABS material, silver appearance, fashionable and practical, can be used for a long time. 5、Wide Applications: This wireless door bell can be used for home, office, apartment, school, villas, warehouses, hotel, factory, hospital or other places. 1 x Receiver1 x Transmitter1 x Adhesive1 x Slogan1 x Specification2 x Screw Item Type: Wireless DoorbellMaterial: ABSWeight: Approx. 121g/ 4.3ozColor: SilverReceiver Size: Approx. 20x56x90mm/ 0.8x 2.2x 3.5inTransmitter Size: Approx. 20x46x77mm/ 0.8x 1.8x 3.0inTransmitter Power Supply Battery: 1 23A 12V battery (not included)Plug Voltage: EU plug 220VFeatures: 36 songs with 4 volume levels