Features:
Consists of 2 same transceivers, both of which can be a receiver as well as as transmitter.  
Can also buy additional transceiver(s) to trigger 3 or more flashed at the same time.
Support the flash installed on transmitter(on-top flash) and supports i-TTL function & master control mode.
Supports "622" and "603-RX" communication mode，can receive the triggering signal of YN-560TX/RF605(603 mode)/RF603(II) series products.
Compatible i-TTL/Manual/Multi flash modes, and support i-TTL/Manual/Multi flash mode mix using(mix control mode).
Support remote set the parameters of flash through the transceiver(remote control mode).
Compatible Shutter Sync: front-curtain, rear-curtain, high speed sync(HSS/FP), max 1/8000s sync speed.
Support FEC, FVL, BKT function.
Support modeling flash and red-eye reduction flash.
Support flash zooming (auto).
Built-in AF assist beam emitter(AF Lamp).
Support PC port triggering strobe flashes and support front-curtain, rear-curtain, high speed sync(HSS/FP).
Settings saved automatically.
Support single-contact of camera & flash triggering.(max sync speed is 1/250s)
Support USB firmware upgrade.
Quick lock design, easy to use.
Compatible camera list:
for Nikon D70, D70S, D80, D90, D200, D300, D300S, D600series, D700, D800series, D3000series, D5000series, D7000series
Compatible i-TTL flash list:
for YongNuo YN 465, YN467, YN468, YN565, YN568 (for Nikon series)
for Nikon SB-600, SB-700, SB-800, SB-900, SB-910
List of the master unit that supports the master control mode on the transmitter:
SB-700, SB-900, SB-910
The following functions refer to the camera and the flash:
FVL, BKT function
Modeling flash
Red-eye reduction flash
Zoom
Specifications:
System type: Digital FSK 2.4GHz wireless transceiver
Distance: 100m
Channel: 7
Groups: 3 groups(622), 6 groups(603-RX)
Flash mode: i-TTL, Manual flash
Sync mode: front-curtain, rear-curtain, high speed sync
Max Sync Speed: up to 1/8000s
Input: Hotshoe(TTL, main contact)
Output: Hotshoe / PC port
Battery: 2 * AA battery (Not included)-for one trigger
Item Size: 9 * 5 * 4cm / 3.5 * 2.0 * 1.6in
Item Weight: 93g / 3.3oz
Package size: 14.8 * 12 * 5.5cm / 5.8 * 4.7 * 2.2in
Package weight: 268g / 9.4oz
Note:
The battery is not included.
Package List:
2 * Transceiver
1 * User Manual(English & Chinese)