This is a DCC Concepts DCD-ZN218.6 Zen Black 8 And 21Pin 6Function Decoder Zen Black Decoder: Versatile 8 and 21MTC connection ability. 6 full power functions.Zen decoder software has always been smooth, clever and easy to use but our new BLACK decoder range takes this to a new level, with extended and improved automatic braking and shuttle abilities, simple-to-use ONE step locomotive set-up and advanced brown-out protection.All of our decoders are tested at least 3 times before we package them for sale, so we know that they all work perfectly when we sell them and you can be quite confident that reliability is assured.Decoder features:1.1 Amps peak power750mA continuous power6 functions at 100mA each22mm x 16mm21 direct, 8-pin and harnessOne-Step Loco SetupShuttle mode (requires ABC boards for this to function)