With the KlikAanKlikUit ACDB-7000AC, you can put up your new wireless doorbell with ease. Plug the wireless receiver into a socket of your choice and place the splash-proof doorbell button at the door. The receiver and transmitter automatically make contact with each other, so you don't need to worry about that. You have a choice of 5 melodies and 4 volume levels. In addition, an LED indicator will flash when you press the doorbell. Expand the doorbell with more receivers and you'll hear the bell ringing in different rooms in the house.