More on Amazon.com : http://www.amazon.com/gp/product/B00A47U22U?tag=thefatkidin06-20 <br /> <br />Neewer 16 Channel Wireless Remote FM Flash Speedlite Radio Trigger with 2.5mm PC Receiver for <br /> <br />Channel16 Operate frequency 433MHZ <br />Sync speed 1250s <br />Work range 30M Screw mount on receiver 14 <br />Battery for tramsmitter 23A-12V mini batter the battery included <br />Batery for receiver 2x15V AAA battery the batteries not included