Features –

• 2.4GHz, 100m Range
• Remote Manual Power Control in 3 groups from the camera menu
• ETTL Ratios and FEC set from the camera menu (ALL/ A:B/ A:B C)
• Pass Through Hotshoe allows Flash On Camera in ETTL or Manual
• HSS (FP high speed sync) up to 1/8000th (with compatible flashes)
• FEL (flash exposure lock)
• FEC Flash Exposure Compensation in TTL
• FEB Flash Exposure Bracketing
• Second Curtain Sync
• Remote Flash Zoom Setting from camera
• Test Fire Button on TX – Should allow light meter use in remote manual
• Sync port for studio lights
• LCD Live view triggering
• Transceivers means there are back up transmitter units
• Supports single contact flash triggering
• A number of inexpensive compatible flash options
• Regular AA batteries
• Comes with both Canon shutter release cords.

The Groups and Channel button on the back of the case will be a big improvement over the YN-622C, which is very easy to knock the Channel button off channel while pressing the Test Fire button.

The FC-210C only has 2 Channel options available, but that is generally enough for most people.

“Flash” Sync port for studio lights is the regular PC sync type. A 2.5mm (or better still 3.5mm) mini-phone socket like the “Camera” or shutter release socket would have been better for both.

Batteries are standard AA, and slide in from the side. Which must leave it pretty tight inside the case to fit the circuit board.

The case is recycled from Viltrox JY-2410 fully manual transceivers released a couple of years ago now. But loosing the 1/4″ 20 threaded mounting hole on the side (which was likely pretty useless anyway).

Provided the Viltrox FC-210C are derived from the Pixel King and King Pro they should be a lot of bang for buck for a minimum priced TTL trigger. A few people have confirmed they do appear to be working as expected.

If you only need a simple TTL trigger, no ratios or remote manual, the Rikon Meyin RF-624 (also a Pixel derived transceiver) offer twice the range for the same base price.

If you’re a bit more serious, and sure to grow and expand the system, the YongNuo YN-622C would be a more suitable place to start, and for not too much more expense.