Features: This set consists of a signal sender and two receiver triggers. Universal hot shoe interface, compatible with Canon, Nikon, Sigma, Olympus, Pentax, etc. (except Minolta SONY, as they use a special hot shoe). Globally universal 433MHz frequency, 4 channels. Equipped with studio flash interface, capable of triggering various types of studio flashes. Transmitting distance up to 30 meters, with no limitations on direction or angle. 1/4" nut allows connection to tripod or light holder for secure and stable flashlight placement. Energy-saving design powered by a 12V 23A battery for the transmitter and 2 x AAA batteries (not included) for the receiver. Includes a PC sync cord for cameras without a hot shoe socket. Note: This trigger does not support TTL function. Specifications: Transmitter power: 23A 12V mini battery (included) Receiver power: 2 x 1.5V AAA alkaline battery (not included) Outdoor working distance: up to 30m / 90ft (open area, no interference) Indoor operating distance: up to 25m / 75ft Channels: 4 Frequency: 433MHz Sync speed: Max 1/250sec Color: Black Material: Metal + Plastic Package size: Approx. 10 x 8.5 x 5cm / 3.9 x 3.4 x 2.0in Package weight: 113g / 4.0oz Package Contents: 1 x 4-channel Transmitter 2 x 4-channel Receivers 1 x PC Sync Cord (2.5mm to PC) 1 x User Manual (English) Note: This item includes only the trigger set and sync cord.