This is the Digtrax DH127P Economy 8 Pin Plug HO Scale Decoder.

• Fits many 8-pin Medium Socket DCC-Ready HO locomotives
• Digitrax 9-Pin Socket and P-Harness
• Medium Plug with approximately.3.2" wires
• 1.0 Amp/2 Amps Peak
• 2 FX7 Functions, 200ma Output