Depending on the music you’re listening to, watching a VU meter bounce to the music is always a good time. So why not integrate the VU meter right into the audio source?

A rechargeable, user-replaceable 3,000mAh battery provides up to 10 hours of playback through the speakers when playing a tape, or up to 15 using an external audio source.

Offer expires 6/30/2008. 2.21 The VU and the VI Instrument Volts, amperes, and watts can be measured by inserting an appropriate meter into the circuit. If all audio signals were sinewaves, we could ...

So he built a signal strength meter for his Datasette. He calls it the VU-sette since it uses an analog style meter quite similar to the VU-meters found in many audio equipment.