The 2.4GHz Wireless Trigger Transmitter is very convenient and inexpensive, it can be mounted on the hot shoe and has the trigger for the 3.5mm (1/8”) sync cable for connection to other flashes and the ¼” thread.
Features:
Frequency: 2.4GHz Wireless
Range: up to 100m without interference
Groups: 4
Channels: 16
Power supply: 3V batteries
Size: 3x3,5x6,5cm
Weight: 35g (excluding batteries)