Sekonic RT-32 Radio Transmitter Module installs easily, enabling wireless, Selective Quad Triggering of PocketWizard-enabled electronic flash units up to 100" away. Radio Triggering Module RT-32 - The Radio Transmitter Module plugs directly into a built-in compartment behind the battery door. Compatible with both the L-358 and L-608 (also L-608CINE) and the older L-558 as well. The Transmitter module triggers the electronic flash units wirelessly as the meter takes a measurement. Channel ID"s are easily selected through the meter"s built-in software. (CH 1-16 Single Remote Triggering, CH 17-32 Remote control "Quad Triggering"), compatible with PocketWizard Digital Radio Slaves. No more tripping over synch cords, or fumbling with PC connectors. Compatible with all PocketWizard Digital Radio Receivers. You can also select through the meter"s software, - Quad Triggering mode - which provides you with up to four zones of lighting control remotely. Now you can individually measure several flash units wirelessly with the touch of the meter"s measuring button, without walking over to each light and turning them on or off. You can even trigger motor driven cameras from the meter. Part of the Digital Wireless Freedom system, the L-608, L-608CINE, L-358 and L-558 are wireless exposure meters and exposure makers.