The ROOK professional flash trigger can work as flashgun trigger, studio light trigger, Transmitter's hot shoe support TTL flash,and can sync the receiver to trigger the flash on it.

Multi groups design:the transmitter can separately control groupA,B and C,and your can set 7 firing comzinations to control flash firing.

Specification:
Wireless Frequency System: FSK2.4GHz
Operating Distance: up to 200m
Shutter Sync Speed: 1/250s
Group setting: 3 difference group(7 combinations) 
Wireless Channel: 4
Stand-by Time: Rceiver:250 hours
Power: AAA×2
Weight: Transmitter 48.5g (without battery) 
Receiver 44.0g (without battery) 

Packing list: 
ROOK Transmitter: 1pcs
ROOK Receiver: 1pcs
Studio light cable(3.5-3.5):1pcs
Studio light cable(3.5-1/2): 1pcs
Receiver holder: 1pcs
Hot shoe protector: 2pcs
Manual: 1pcs

• 1.Trigger mode:transmitter hot shoe supports TTL function and can sync with off-camera flash，replacement yongnuo RF-603/RF-603II.
• 2.Multi groups design:the transmitter can separately control groupA,B and C,and your can set 7 firing comzinations to control flash firing.
• 3.System Mode: FSK 2.4GHz wireless control system.
• 4.Distance range: 200M
• 5.Wake up function available,the flash will be wake up automatically.

1.Trigger mode:transmitter hot shoe supports TTL function and can sync with off-camera flash，replacement yongnuo RF-603/RF-603II.Pixel