Double Mini Battery Module
This battery module is recommended when you need to use our small microphones in high SPL situations. The case of the mini battery module is made of lightweight black ABS plastic.
This product will power two stereo pairs of microphones with 12 volts of bias power (sometimes called "plug in power"). Most small Electret Condenser microphones will enjoy improved high SPL performance with this higher power, since most portable recorders only provide about volts plug in power at the mic input.
Read this FAQ which explains why you may need battery module or mic preamp for your situation.