Becker CentralControl CC41 Smart Home Central Control for B-Tronic, C-Tronic and C-Tronic Plus (CC41 Without USB Wireless Stick) : Amazon.de: DIY & Tools
Becker Mini Handheld Transmitter 1 Channel for Garage Door Control Beck-O-Tronic 3 + 4, Wireless Handheld Transmitter, Garage Door Opener in Blue/Red Design : Amazon.de: DIY & Tools