Do you need to buy a flasher for Nikon d7 100?

Most domestic compatible flashlights can't recognize the off-board flash command of Nikon SLR to realize Nikon's unique iTTL flash, so it is necessary to add a flasher with its own 2.4GHz channel to the hot boots to realize ordinary off-board TTL flash. I heard that many merchants sell this kind of lamp with a discount package and an X 1 flasher. If you want to play advanced flash photography, buy one.