Features:This set consists of a signal sender and two receiver trigger.Universal hot shoe interface, compatible with Canon, Nikon, Sigma, Olympus, Pentax, etc. (except Minolta SONY, for they use a special hot shoe).Globally univeral 433Mhz frequency, 4 channels.With studio flash interface, can trigger several kinds of studio flashes.Transmitting distance up to 30M, no limits with directions or angles.1/4" nut can be connected with tripod or light holder to make flashlight safe and stable.Energy-saving design with 12V 23A battery of transmitter and 2 * AAA batteries(not included) of receiver.Comes with a PC sync cord for cameras without hot shoe socket.Note: This trigger do not support TTL function.Specifications:Power of transmitter: 23A 12V mini battery(included)Power of the receiver(AC): 2 * 1.5V AAA Alkaline Battery(not included)Outdoor working distance: max. 30m / 90feet (open area, no fraise)Indoor operating distance: max. 25m / 75feetChannel: 4 channelsFrequency: 433MhzSynchronous speed: Max. 1/250secColor: blackMaterial: metal + plasticPackage size: approx. 10 * 8.5 * 5cm / 3.9 * 3.4 * 2.0inPackage weight: 113g / 4.0ozPackage Lists:1 * 4-channel Transmitter2 * 4-channel Receivers1 * PC Sync Cord(2.5mm to PC)1 * User Manual(English)Note:This item only includes the trigger set and sync cord.