Check the listing for details. Promaster ST1C Wireless TTL Transceiver (For Canon Cameras). Condition: Open box. Listed at 40.00 USD. Promaster ST1C Wireless TTL Transceiver for canon EF Cameras Specifications from manufacture's website: Overview: + Multiple Channels+ HSS high-speed sync: TTL 1/8000+ 325’ range+ Functions as a transmitter or receiver + AF assist beam+ Also works as a wireless shutter release (with additional cable)+ USB firmware upgradable+ Stand included Specifications: - 2.4GHz operating frequency - Manual output setting: 1/1 - 1/128 - Master/Slave Mode - Net Weight: 3.5oz / 98g (without batteries) - Dimensions: 3 1/6” x 2 9/16” x 2 7/16” (77.8mm x 65mm x 62mm) - Power Source: 2 x 1.5V AA alkaline batteries, 2 x 1.2V NiMh batteries The following cables are available to expand the capabilities of the ST1- ProMaster 6368 camera triggering cable for Nikon MC30 port - ProMaster 6375 camera triggering cable for Nikon MCDC2 port - ProMaster 6382 camera triggering cable for Canon RS80 port - ProMaster 6389 camera triggering cable for Canon RS60 port - ProMaster 3717 USB firmware downloading cable for computer connection