Remote control trigger of high capability,including one trigger and one receiver.It is very small and handiness. It is easy to add any sync socket of Flash light. It can self-motion flash with flash light at the same time.So the small pressure is its excellence. It only need two 1.5V(AAA type)battery No.7.It is especially suit for digital camera to use.Four channels,sixteen channels and professional grade of four channels for your selection. It can prevent other system to interfere.Work range is up to 20m.Sync transmittal time is 1/1000s and 1/1500s.The emitter select 12V 23A of battery. The battery can shoot more that thirty thousands time.Any wany, it is in possession of god solicitation capability.