Yongnuo RF-603C II Wireless Flash Trigger Kit for Canon 2.5mm Connection Flash Accessories There are even magnetic closures

There are even magnetic closures embedded in the lid

1" standard spacing dual row header

the PTC ‘resets’ and allows current up to 250mA to flow again

because the outside dimensions of the board don’t matter anymore

Adhesion to steel: 11

Yongnuo RF-603C II Wireless Flash Trigger Kit for Canon 2.5mm Connection Flash Accessories There are even magnetic closuresFrequency: 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 2. 5mm