The Hornby HM7040: Bluetooth Legacy Dongle. This Bluetooth Legacy Dongle allows the HM | DCC app to work with older DCC Controllers from Hornby. Add Bluetooth and Smartphone/tablet control to your existing Hornby DCC Controllers! The dongle works with all Hornby DCC decoders - including the Elite, Select and Railmaster. This will allow the HM | DCC app to control of all your previous non-Bluetooth decoders. The Legacy Dongle works via the XpressNet socket - this is a common socket included in many other brands of DCC Controller, however, Hornby are unable to confirm if the Dongle will work seamlessly with other brands of controller. Manufacturer: Hornby Model: R7321 HM7000-6: Bluetooth & DCC Decoder (6-pin)