Features: 100% brand new and high quality. It is professioanl and so practical. 4 channels with hot shoe connector for external flashes Special working options are available You can trigger both the flashgun and studio lights with this trigger With studio flash interface, can trigger several kinds of studio flashes. Easy to operate and to install. Specifications: Color:Black Transmitter Power: 23A 12V battery Receiver Power: 2 AAA Battery (Not included) Maximum Working Distance: 30m Operates on Frequency: 433MHz Package Size: 6.6 * 6.6 * 4.5cm Receivers Size:60*45*39mm Transmitter Size:60*28*36mm Package include: 1 x Transmitter (with 23A 12V battery installed) 2 x Receivers (Powered by 2 x AAA, Battery is not included) 1 x Sync Wire Cable (no need to use it for most flashes)