It's easy to replace your current doorbell with the KlikAanKlikUit ACDB-6600AC. The set consists of a doorbell button and a receiver. You should install the doorbell button onto the door frame. The receiver runs on batteries, so you're not tied to a power socket in your home. You can easily take the receiver wherever you want in your home. This is a convenient feature when you're in the attic or working in the garden. You can choose 1 of the 5 melodies. The doorbell also has 4 volume settings, so you can set the doorbell as loud as you want. If someone rings your doorbell, you'll hear the sound of the doorbell and you'll also see a flashing light. The latter is especially convenient for senior citizens and the hearing impaired.