1-Do I have to buy one unit for each flash that I want to use?
2-I use an app called 645Pro. This app allows me to change settings. Can I use this app with my iPhone 6Plus and your product?
1. There are two solutions:
1) Each flash with one Tric device: Up to 4 devices can be connected through paid app TricCam. Free TricCam Lite can only connect to one Tric device.
2) Use only one Tric device to master flash, and set other flash units to optical slave mode.
2. It is required to use our app to trigger Tric device. Other apps cannot trigger it.