This can be a problem with lower power portable battery banks.

Try setting the volume knob to off, counterclockwise until it clicks. and then plug in the unit in.

A social network is a social structure made up of a set of social actors (such as individuals or organizations), sets of dyadic ties, and other social.

A social network is a social structure made up of a set of social actors (such as individuals or organizations), sets of dyadic ties, and other social.