Yongnuo Digital Wireless Flash Trigger CTR-301P

Functions:
Trigger the flashlight separately (without flash transmitter) because there is a very sensitive light senser on this receiver.
Trigger the flashlight with the CTR-301 transmitter together.
1/4 stand Tripod screw hole can be mounted into the tripod, ballhead, and so on.
Trigger the vedio flash via the PC cable. (The little plug is 2.5mm, the big plug supports 6.35mm standard vedio flash jack)

Feature:
Powerful Functionality: Trigger the off-camera flashes and studio strobes/monolights perfectly. 
Two ways to Triggering: wireless triggering and optical triggering. 
Outstanding Performance: Very stable, NEVER misfires in our customers' experience. Up to 100 meter remote distance (Test it in 30m distance without interference, perfectly work), 1/250s sync speed (Tested on D300 + 580EXII, SB-800, perfectly work on 1/250s). CTR-301P is a very good flash trigger and it is very popular with photographers. 
Optimized Designs: This CTR-301P is an upgrade version of CTR-301: 
Replace the previous "TEST" button to the 2.5mm PC port. The receiver can be easily attached to the Off-camera flashes or studio strobes/moonlights with the 2.5mm-2.5mm or 2.5mm-6.35mm cables. Add a 1/4" screw hole on the receiver bottom, can be mounted on the 1/4" tripod bolt, or mounted on the umbrella bracket which has a 1/4" screw. This hole is very good to use.

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