If you need to mic up a second person you will need an additional Wireless GO system. You can attach both receivers to the cold shoe of your camera using the DCS-1 dual cold shoe mount. Then use the SC11 splitter cable to connect both receivers to the single mic input of your camera. If you want to connect the Wireless GOs to your phone you will also need the SC4 adapter cable – simply plug the SC11 single input into the SC4 and then into your mobile device.