New generation TTL wireless flash tigger, If you need a pass-through hotshoe, go for the XPro II instead. Godox MF12 K2 Macro Flash 2.4G Wireless Speedlite For Canon Nikon Sony Fujifilm 299.00 GBP. Designed for the 2.4 GHz Godox X wireless radio system, this XProII TTL Wireless Flash Trigger lets you effectively and reliably trigger flashes up to 328' / 100m away.
eBay