TCS KAM4, HO Scale Motor Decoder:
This hardwire decoder is the smallest decoder with built in Keep-Alive™ that we produce. It will keep your locomotive operating for 6-15 seconds without power (As a result of dirty track, poor contacts, etc.). While physically larger than a M-series decoder, the KAM4 features the same operational characteristics.
 
Keep-Alive®: Included on-board for smooth, stutter-free operation.
Back EMF Load Compensation: Provides superior slow speed control and high performance under load.
Quiet Drive: Super-quiet motor control for "buzz" free motor performance.
DC Mode: Decoder will automatically detect DC power. You can also configure how your lighting effects function on DC.
Variable Momentum: Allows you to make custom acceleration and deceleration curves.
Incandescent Bulb Support: This decoder can be used with 12 Volt bulbs.
Function Remapping: Buttons 0 through 12 may be used to control the lighting functions of this decoder.
Programmable Lighting Effects: Choose from 20 separate user-programmable lighting effects!
Dimmable Brightness: Configure multiple different brightness levels for your LED's or incandescent bulbs.
Decoder Lock: Feature which prevents accidental/unwanted programming while activated.
Airwire™ Compatible: Fully compatible with Airwire™ operation.
User-Loadable Speed Tables: Configure custom speed curves and set speed limits.
 
MSRP is $72.95. (Picture courtesy of TCS.)