The Neumann BS48i is a single channel +48 volt phantom power supply. The BS48i provides +48 volt phantom power to condenser microphones and the balanced XLR, DC-free audio output doesn't require a transformer when connecting to unbalanced inputs. The BS48i will operate up to 20 hours on a single 9-volt battery.
In the Box
Neumann BS48i - Single Channel, Battery Operated Phantom Power Supply