The Alecto ADB-17 is a wireless doorbell for use at home. Both the doorbell button and the receiver run on batteries, so you can place them wherever you like. You can choose between 36 different melodies and turn the volume up or down. The doorbell and receiver are wirelessly connected and have a range of up to 30 meters. Use this set as an extra doorbell in addition to your current doorbell, or to keep an eye on someone who's unwell. You can give the doorbell button to the disabled person and the receiver to the carer. The receiver's lighting means you can both hear and see when someone pushes the button.