The M2000WI pack comes standard with built in 32-channel Pocket Wizard Digital Radio receiver circuitry. The pack allows you to fine tune your power settings in 1/3 stop increments, for up to a 6 f/stop range. A switchable audible ready incicatior, proportional modeling light control, and much more offer all of the power, convenience and reliability you've come to expect from Dyna-lite products.