Yongnuo RF-603C II Wireless Flash Trigger Kit for Canon 3-Pin Connection Products you can use 2mm sockets

you can use 2mm sockets instead

DCS : 1710 to 1880MHz

two screw terminals (one 2-pin and one 3-pin)

After assembling the kit you’ll have access to four different voltages (3

They get warm to the touch but not too hot

Yongnuo RF-603C II Wireless Flash Trigger Kit for Canon 3-Pin Connection Products you can use 2mm socketsFrequency: 2. 4 GHz Range: 328' Channels: 16 Flash Sync Speed up to 1 320 sec Dual Function Shutter Release Can Set Transmit and Transceiver States Hot Shoe Mount PC Sync and 2. 5mm Ports Shutter Release Cable Included Each Trigger Runs on 2 AAA Batteries This RF 603C II Remote Flash Trigger Kit from Yongnuo features two 16 channel, 2. 4 GHz transceivers as well as a shutter release cable for remote triggering of Canon cameras with a 3 Pin connection.