BAC-36505 EZ Command Dynamis Wireless DCC System. Two-way wireless infrared operation Constant digital information updates of handset commands to locomotive, and of locomotive performance back to handset Joystick control for locomotive selection and speed Programming on the main 9,999 locomotive addresses Supports 14, 28 or 128 speed steps Full CV programming Turnout and accessory control Easy-to-use backlit LCD screen Control of up to 40 locomotives at any one time (up to 21 functions per locomotive) Allows 40 consists of up to five locomotives each Universally compatible track connection Expandable modular design Four AAA batteries included Suitable for all layouts, from train sets to sophisticated railroads 2.3 amp power supply Conforms to all applicable NMRA standards