The doorbell with simple and creative design, easy to use and easy to install. No need for wiring, a good helper for home use. High launch technology, stronger penetrating power, let you easily hear the in the whole house. Features -Color: White. -Material: ABS. -Size: About 7.70X4.60X2.00cm/ 3.03X1.81X0.79in. -Consumed power: 0.5 (W) -The power supply voltage: 5 (V) -Scope of application: Distance in the open space of 150 meters -The bell: 60 pieces of music levels -Type: doorbell - Setting different ringtones for different receivers can let you know which door is at. - Just plug the receiver into a USB interface, mount the doorbell transmitter on the wall or anywhere you want via -sided tape or screws. - The door chime has been matched before shipment. All the required accessories are included in the package for an effortless installation. - door bell kit has stylish modern design in classic color, excellent materials keeps itself from getting higher temperature & . - Higher without worrying about obstruction, ensures you will never miss a visitor, even if you are a few rooms or on another floor. Package list: 1 x Transmitter 1 x Receiver 1 x USB Cable