Kaavie Wireless Radio Flash Trigger Control with Umbrella Holder for Sony Cameras and Sony F36AM, F42AM, F56AM, F58AM, Konica Minolta 3600HSD, 5400HSD and 5600HSD Flashguns 4 Channels design and operation frequency is 433Mhz. It's compatible with Sony F36AM, F42AM, F56AM, F58AM, Konica Minolta 3600HSD, 5400HSD and 5600HSD. For Sony F42AM flash please see the last paragraph of product description. Standard 1/4" thread for fitting to a standard tripod, standard pc sync socket Operation range can be up to 20 meters (open area without interferences) Max Shutter Sync Speed: up to 1/250th second. Compatible with most flash units with standard hot shoe. Please use Alkaline batteries only (1.5v). The trigger isn't compatible with Sigma flashguns.