PocketWizard Plus X Radio Trigger with 10 Channels, Hildozine Transceiver Caddy 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