This is the Throttlepack AC 80W from MRC.
Suitable for Ages 14 & Up.
FEATURES: Compatible with just about every AC powered model locomotive and
their sounds
Special sine-wave output circuitry provides plenty of controlled
power
Separate, UL Listed power supply keeps the THROTTLEPACK AC
footprint small
Whistle/horn & bell buttons included
Special "Booster" button for added power when needed
Precise, slow-speed throttle control for realistic performance
Direction button
INCLUDES: One MRC Throttlepack AC 80W
SPECS: Input: 120V AC 60Hz
Output: 0-24VAC variable
Total Output: 64VA
Length: 8-1/2" (215.9mm)
Width: 4-3/4" (120.65mm)
Height: 4-1/2" (114.3mm)