This receiver works with Cactus Wireless Flash Trigger unit V4 when the transmitter is activated. Several flash units work together helps fill in shadows and improve the evenness of lighting.

Each receiver works with one flash. You can use as many flashes as you wish as long as you have enough receivers. Simply attach the hot shoe of the external flash to that of the receiver, or use the flash's connection cable to connect the receiver and the flash.

With Cactus wireless flash trigger, you can place the flash at different angles and distances from the object. This is particularly useful for portrait and product photography. Most importantly, without the need to connect the flash by wire or cable, you can move the flash to anywhere that produces the best lighting to the object you shoot. Flexibility provides you with the best result. The innovative standing design allows major portable flash unit to sit securely on it without a separate light stand.

The receiver, once picks up the signal emitted from the transmitter when shutter is pressed, will trigger off the external flash unit. Highest responding time is 1/1000s. (actual sync speed varies from 1/125s to 1/600s depending on the sync speed limit of the camera system).

Notes on compatibility:

1. Cactus V4 does not work with V2s or V2;
   
2. Cactus V4 does not transmit TTL information.
   
3. Some dedicated flashes (e.g. Nissin Di-622 and Di-466, Sunpak PZ42x and PZ30, Sigma EF-530/500 DG ST for Canon, etc.) are triggered via system-specific pins instead of the central contact of the hot shoe. Cactus V4 does not work with these flash models. To check whether your dedicated flash units are compatible with Cactus V4, try attaching them to a camera of other brand (e.g. attaching a Nikon TTL flash to a Canon DSLR camera). If the flash can be triggered, it will work with Cactus V4.
   
4. Tested with the following flash models:
   
   • Cactus AF45, KF36;
   • Canon SpeedLite 580EX II, 580EX, 550EX, 540EZ, 520EZ, 430EX II, 430EX, 430EZ, 420EX, 420EZ, 380EX;
   • Metz 58AF, 48AF;
   • Nikon SpeedLite SB-900, SB-800, SB-600, SB-28, SB-27, SB-26, SB-25, SB-24;
   • Olympus FL-50R, FL-50, FL-36R, FL-36;
   • Pentax AF-540 FGZ, AF-360 FGZ, AF-400 FT, AF-240 FT;
   • Sigma EF-530 DG Super, EF-530 DG ST (for Nikon only), EF-500 DG Super, EF-500 DG ST (for Nikon only), EF-430;
   • Sunpak Auto 2000DZ, 622 Pro, 433AF, 433D, 383, 355AF, 344D, 333D;
   • Vivitar 285HV, 285, 283, DF-400MZ, DF-340MZ;

Specifications:

• Cactus Wireless Flash Trigger V4 (RECEIVER ONLY);
• Flash voltage handling: up to 300 volts;
• Compatible to portable flashes and studio strobes;
• Connection port: 3.5 mm (1/8”) mono mini-phone;
• Includes one 3.5mm to PC sync cable;
• Dimensions: 74 x 45 x 28 mm;
• Weight (including battery): 55 grams;
• Power input: two (2) AAA size 1.5V (IEC: R03) batteries;