Sennheiser,SK500,G2,SK300,MKE2 Gold,IEM,LavalierMKE2 Channel Splitter Cable for Sennheiser Wireless SK100, Sk300, Sk500, G2,G3,G4 split one signal on two different channels / frequencies have a redundant safety backup track for your recording -- if you use 2 different channels/frequency bands you likely won't have an interference drop out at the same time on both channels-- ONLY THE SPLITTER CABLE IS FOR SALE... the sennheiser transmitters and the lav. mic shown in the picture are NOT part of the deal!.