PocketWizard Plus X Power Transceiver (Pair) + Accessory Pack (5 items) Auto-Sensing Transceiver - Easy to use. No settings to make. 10 Channels 1-4 Classic plus 5-10 low-traffic channels Backlit Channel Dial - Easy to set channels in the dark Internal Antenna - Compact, more rugged design Auto-Relay Mode - Trigger remote camera and flashes simultaneously Transmit Only Mode - Positive operation in large groups Side View Design - Better subject view on camera Pocket Wizard reliability - Pocket Wizard compatibility Designed to carry 2 PocketWizard radios -Black zippered ripstop nylon-Lightly padded interior -Full length zipper pocket on the back