Compatible with almost all AC-powered, O scale locomotives and their sounds, this 80-watt controller/power pack features special sine-wave output circuitry for up to 24 volts of controlled power; precise, slow-speed throttle control for realistic performance; whistle/horn and bell buttons; a special "booster" button for added power when needed (for heavy freight loads and inclines); a power supply; and more. 8½"x 4¾"x 4½". #0R94251