This is the Soundtraxx 885614 Blunami BLU-PNP8 GE 8 Function Sound Decoder - Plug & Play Form Factor.

Blunami will change the way you enjoy the model railroading hobby! The BLU-PNP8 is a universal factory board replacement sound decoder suitable for use in many manufacturer’s diesel models such as those made by Atlas, Athearn, and InterMountain Models. It is suitable for a wide variety of models from HO to S scale. It can be operated in three different ways: DC, DCC, and Wireless mode. Using the Blunami App, you can operate your locomotive incredibly easily.

Decoder Features:
Max. Motor Stall Current: 2A
Max. Function Current: 100mA (each output)
Function Outputs: 8
Audio Amplifier: 2 Watt, 8-Ohm Load
DCC Track Voltage: 7V – 22V
Sound Channels: 16

Dimensions: 2.91 x 0.67 x 0.2 inches (74 x 17 x 5mm)