Group of guitar amplifiers and tuners. includes a maiden Korea rampage amplifier that can run off of 120 V or batteries, small Dean Markley mini amp that runs on batteries only, a Korg GT6 guitar tuner and a guitar research GMT – 202 guitar and bass tuner. The last three or powered with a 9 V battery and there is no corrosion in any of the compartments. The larger amplifier can be powered with eight AA batteries. none of the smaller battery powered pieces have been tested and are sold as is.