Guitar Mic vs Guitar Mic B

What's the difference between your two mics for acoustic guitar?
Both mics are for temporary mounting on a sound hole. They sound the same, but they have different powering and connections:

Guitar Mic:

• Phantom powered
• 8-foot cable from mic goes to an XLR connector
• Connects to a sound-system mixer or to an instrument amp that has phantom power
• Also connects to any phantom power supply, which connects to an instrument amp or mixer that lacks phantom power

Guitar Mic B:

• Battery powered. The battery lasts about one year.
• 8-foot cable from mic goes to a battery box that lies on the floor
• 1/4" phone jack connector in the battery box
• Connects by a guitar cord to an active direct box, instrument amp, or effects pedals
  
  Both mics can be converted to wireless operation using our wireless mic modification.