CT-16 Wireless Radio 16 Channels Flash Trigger Transmitter + Receiver Set (Optional) The remote trigger for studio flashes and outdoor flashes is used as a controller for synchronous trigger studio flash for cameras. It consists of a signal sender and a receiver trigger and functions by means of the wireless remote control for frequency modulation. The signal transmitter adopts the advanced circuit and components and can transmit the coded wireless FM signal. The transmitter circuit has the function of standby and hibernation, so it has low power consumption; the products can work in standby mode for more than one year with only one battery; triggers continuously thirty thousand times. The trigger current is only 0.01MA, which will definitely not cause any damage to the camera's flash contact. The transmitter is applicable to the traditional or digital camera with hot shoe or PC control interface. The receiver trigger uses dry battery for power supply, which is safe, energy-saving and convenient. The product adopts microcomputer to control the decoding, which has superior anti-interference capacity; sensitive reaction speed, the highest synchronous speed can reach 1/250sec. All models of the product have uniquely multi-frequency isolation technology and the self coding matching function by users. Users can freely match and use the sender and the receiver according to the requirements, which have 16 isolated channels to suit for specific shooting environments. Triggers sets in different channels can be combined to work or independently work but don't interfere with each other in an effective distance. Features Universal hot shoe interface 433MHz transmit frequency ensures fast response and stable transmission 16 channels, transmitting distance up to 30m, no limitations with directions or angles Maximum synchronous speed up to 1/250 second With studio flash interface, can wirelessly trigger multiple types of studio flashes Speedy frequency regulating, convenient for photographers to shoot Energy-saving design with 12V 23A battery for transmitter and two AAA batteries (not included) for receiver Comes with a PC sync cord for cameras without hot shoe connections Note: This trigger does not support TTL function. Compatible with: For Nikon SB-900, SB-800, SB-600, SB-28, SB-27, SB-26, SB-25, SB-24; For Canon 580EX II, 580EX, 550EX, 540EZ, 520EZ, 430EX/EXII, 430EZ, 420EX, 420EZ, 380EX; For Pentax AF-540 FGZ, AF-360 FGZ, AF-400 FT, AF-240 FT; For Olympus FL-50, FL36; For Sigma EF-500 DG Super, EF-500 DG ST, EF-430; For Sunpak Auto 2000DZ, 622 Pro, 433AF, 433D, 383, 355AFm 344D, 333D; For Vivitar 285HV (Older Vivitar 285/283 works only with PC sync); Other flash models with a trigger voltage of 12V or lower; Work with flash units using universal hot shoe like for Nikon, for Sigma, for Olympus, for Pentax (except for SONY because they use a special hot shoe) Specification: Model: CT-16 Channel: 16 channels Transmitting frequency: 433MHz Power source: 12V 23A battery (not included) Receiver power source: 2 x 1.5V AAA battery (not included) Outdoor operation distance: max. 30m / 90feet (open area, no fraise) Indoor operation distance: max. 25m / 75feet Synchronous speed: Max. 1/250sec Transmitter dimension: 60x42x30mm Receiver dimension: 90x50x32mm Color: Black Material: Metal + plastic Operation Insert the transmitters hot shoe socket into your cameras hot shoe jack, plug the flash onto the receiver, switch ON the receiver. Make sure the channel selector of both transmitter and receiver are at the same channel. Press the Test button on the transmitter to test before shooting. If your camera doesn't have hot shoe socket for connecting the transmitter you can connect the transmitter to the camera by the PC Sync cord provided. (Only the old camera needed). You can trigger both flashgun and studio lights with this flash trigger. If you use the receiver on big studio flash light or AC slave flash, you can just connect the receiver to the studio flash light with a 3.5mm or 6.35mm jack plug PC Sync cable