EZ Command Dynamis Wireless Infrared DCC System features two-way wireless infrared operation, constant digital information updates of handset commands to locomotive and of locomotive performace back to handset, joystick for control for locomotive selection and speed, programming on the main, 9,999 locomotive addresses, supports 14, 28, or 128 speed steps, full CV programming, furnout and accessory control, easy to use backlit LCD screen, control of up to 40 locomotive at any one time (with up to 21 functions per loco), allows 40 consists of up to 4 locomotives each, universally compatible track connection, expandable modular design, four AAA batteries included, suitable for all layouts from simple sets to sophisticated railroads, 2.3 amp power supply, conforms to all applicable NMRA standards