Shure SB903 Lithium Ion Rechargeable Battery Vocal Processors there are also DC output

there are also DC output connectors that can supply power for up to three volca units

1mm DC jack (center negative)

with three 12AX7s in the preamp

It is ideal for connecting pro audio gear to consumer audio components

while playing a solo over the top

Shure SB903 Lithium Ion Rechargeable Battery Vocal Processors there are also DC outputStep up to Shure rechargeable power management for your SLX D systems. The SB903 Lithium Ion Battery provides up to 8 hours of power for use with SLX D Digital Wireless transmitters. View the battery charge in real time HH: MM, accurate up to 15 minutes, visible on both SLX D transmitter and receiver displays. Plus, track battery charge cycles and overall health statistics. Charge with Shure SB203 Dual Docking Charging Station or SBC10 903 Single