The more common type of tape echo is a small portable unit.

I was able to put her on a portable unit.

Just get the portable unit, and I'll be on my way.

The result is a portable unit whose performance matches that of advanced home equipment.

"From what I can tell, that is a portable unit for going back into the past."

These are small, portable units that may work for a single room.

The building was built without air conditioning, and portable units are required for the summer months.

A portable unit containing a red and a gold phone stood on a table near the desk.

There is even a portable unit for home use by people who are too busy to come to the Centre.

A small portable unit can be used around a bed, a rug, or taken on vacation.