Product DescriptionSpecifications:Model FT-16STransmitter Power Supply 3V (2 * AA Ni-MH or alkaline batteries) (Not included)Receiver Power Supply 5V ( power by flashes)Transmit Frequency 433MHz wireless remote systemWorkable Distance 50m / 164ft (open areas)Control on Flashes Flash power ratioModeling lamp or AF-assist beam on / offBuzzer on / offPower-ratio display modeFlash triggeringMax. Sync. Speed 1 / 250 secondsChannel 16Compatible Triggers Compatible with Godox Cells II transceiverTransmitter Size Approx. 13.5 * 5.1 * 3.5cm / 5.3 * 2.0 * 1.4inTransmitter Weight 63g / 2.2ozReceiver Size Approx. 5.6 * 3.0 * 1.7cm / 2.2 * 1.2 * 0.7inReceiver Weight 11g / 0.4ozPackage Size 20.5 * 13.8 * 5cm / 8.1 * 5.4 * 1.9inPackage Weight 133g / 4.7oz Package List:1 * FT-16S Transmitter1 * FT-16S Receiver1 * User ManualNote: This item only includes the trigger set, the camera and speedlite not include.