This is the Digitrax DH187P Premium 8 Pin Plug 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
• 8 FX7 Functions, 300ma Output