Caution: color: we ship according to the color of the first picture, in the package: if the quantity is not stated in the description, we will ship the item according to the quantity and model number in the title. Self powered waterproof wireless doorbell no battery led light 200m home cordless bell plug 1 2 button 1 2 receiver| doorbells black features and specifications: 1.Press the button, super learning code can freely learn to match, can be unlimited matching receiver. 2.Instead of using a battery, the button converts kinetic energy into electrical energy and sends a signal when pressed. 3.The transmitter can work normally in snow or high temperature environment, waterproof and dustproof. 4.The receiver voltage is 220v. 5.The receiver is a distance of 200 meters in an open area , which may be affected by the environment and obstacles. 6.Eye-catching backlight flashes when someone pushes the doorbell. Particularly suitable for the elderly, deaf, and pregnant women. 7.The receiver has 48 ringtones to choose from, and the volume is 0-80db in 6levels. 8.Just plug the receiver into an electrical outlet,the push button transmitter can be stick it to the door with provided adhesive tapes. 9.Button size:79*45*22mm 10.Receiver size:100*57*25mm note: the button cannot be placed on an iron door because it will interfere with the signal. If the receiver does not ring when the button is pressed after receiving the doorbell, please pair the doorbell.