Easy Installation: The latest upgrade of wireless doorbell is a battery powered transmitter doorbell. Just plug the receiver into a power outlet, the push button transmitter can be attached to the door with the included adhesive strips. IP44 Waterproof Door Button: The waterproof rating of the door transmitter is IP44, used for rainy days or even hot or cold weather, especially the operating temperature is -30 to 70 degrees Fahrenheit; the waterproof rating only applies to the doorbell button. CE, FCC and RoHS certified. Long Wireless Range: You will be easily informed when someone calls outside your house and never miss your valuable guests. 2 battery powered doorbell transmitter buttons and 2 plug-in home receivers have already been paired at the factory, so you can use it directly for your home Button and Mode of Home Doorbell Receiver: This doorbell has two buttons to control volume. The volume is 25-80dB, 1-38 music optional. Each time you press the mode button, you will change a