Neewer 16 Channel Wireless Remote FM Flash Speedlite Radio Trigger with 2.5mm PC Receiver for Flash Units with Universal Hot Shoe

Specification: Operate frequency: 433MHZ Sync speed: 1/250s Work range: ?30M Screw mount on receiver: 1/4" Battery for tramsmitter: 23A-12V mini batter (the battery included) Batery for receiver: 2x1.5V AAA battery (the batteries not included)...