Wireless Bell, 2 Receivers and 3 Transmitters, Doorbell, Wireless Set, 400 Metres, Range IP55, Outdoor Waterproof, 58 Melodies on 5 Levels Volume : Amazon.nl: DIY & Tools
No Batteries Required] Wireless Doorbell, Waterproof, Electronic Doorbell Set with 2 Receivers, 150 Meters Range, 45 Melodies at 4 Volume Levels for Home, Office, Hotel : Amazon.nl: DIY & Tools
Wireless Bell, Wireless Doorbell, 400 m Range, IP55 Waterproof, with Plug-in Receiver and 3 Transmitters, 55 Melodies on 5 Levels Volume, LED Caller ID, White : Amazon.nl: DIY & Tools