The PHANTOM II Pro from Art is a 2-channel portable phantom power supply with XLR connectors that operates off of two 9 Volt batteries. Condenser microphones with voltage requirements from 9-48 Volts are supported.
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Very happy with the ART Phantom II Pro.� Based on my tests it adds only about 0.5dB of noise and provides absolutely hours of phantom power to a typical pair of small or large diaphram condensor mics with a single 9v battery.� The phantom power provided from a 9v battery isn't quite completely in-spec, which is sufficient for 90% of condenser mics but may be a problem for vintage or particularly voltage-hungry mics.
It works fine and seems to have at least 12 hours battery life providing 48v phantom power though both ports. As other reviewers have said the battery just floats around and is difficult to fish out unless you hold it upside down and shake it. The adapter is a bit bulky and doesn't have any tripod or mic stand threading--would be nice it there was an easier way to mount it to a rig. I ended up using industrial-strength velcro. It does NOT come with an AC adapter and I wasn't able to find an OEM adapter for sale. But B&H does sell a third party adapter from Hosa Technology that has worked fine thus far.