If you order one of our Triggertrap Connection Cables, you'll have spotted that they have a 2.5mm plug on them. However, the Triggertrap v1 has a 3.5mm socket.
Some users try to step up from a 3.5mm to a 2.5mm using the Triggertrap Mobile Dongle, but this is not correct: The Triggertrap v1 has a dongle built in, so if you plug the Triggertrap Mobile Dongle into a Triggertrap v1, it's not going to work.
In the box with your Triggertrap v1, you should have received a small, black 3.5mm (male) to 2.5mm (female) adapter. That's the one you need to use with the Triggertrap cables.