Viltrox FC-16 is a general hot shoe trigger， FSK 2.4GHZ channel， good stability， receive multi-channel. Multi-channel， can be used to trigger studio flash，on-camera flash， more flexible with umbrella port and angle rating bracket.Features:Viltrox FC-16，professional grouping flash remote receiver， adopt FSK 2.4GHZ to ensure effective transmission rate， 100m distance， good stability.Sync speed≥1/200s.Flash trigger function.Simple 4-group design for different shooting sites.Tighter with hot shoe fixed ring.Specifications:Model: FC-16Transmitter frequency: FSK 2.4GHzFlash synchronization speed: ≥1/ 200sTransmitter distance: ≤100mChannels: 4Terminal Connectors of Transmitter: PC input terminal connectorTerminal Connectors of Receiver: 2.5mm PlugNumber of Transmit: About 20，000 timesBatteries: 2 * AAA batteries(Receiver); 1 * 12V 23AE battery(Transmitter) (not included)Package size: 13.5 * 15 * 4cm / 5.3 * 5.9 * 1.6inPackage weight: 130g / 4.56ozPackage List:1 * Receiver1 * Transmitter1 * Cable1 * User Manual(Chinese & English)