MixPre-3 and Orca OR-27 Sound Bag Setup

This is my location sound bag setup based on the MixPre3 Mark II and Orca OR-27 small sound bag. Since making this video, I have added a Rode Newsshooter XLR transmitter into the mix to allow for wireless connection to a boom pole mounted microphone. I am looking for something to allow me to monitor the MixPre3 using my Sennheiser HD25 headphones without having to be tethered to the sound bag. I have also started using the second battery block to supply USB power to the Rodelink Receivers in the bag.