Ring DIN-Schienen-Transformator (2. Generation) – Ring Help
RINGETRAFO TRB 15 8-12V - Elkjøp
C Wire Adapter for Smart Thermostat, 24V Transformer Power Supply for Ring Doorbell, Nest, Ecobee, Sensi and Honeywell Thermostats, 24 Volt 500mA C-Wired AC Plug in Cord, 26FT - - Amazon.com