The Supertooth Disco4: a Lightweight Bluetooth/NFC Speaker with Heavyweight Sound
The Disco4 has an amplifier providing 8 watts of power with a signal bass reflex speaker. I assume it’s a weight-saving consideration, but there are no volume controls - volume is controlled solely by the playback device. The lithium-ion battery provides up to 12 hours of playback at medium listening levels, and about 3 hours at maximum playback.
While not the highest fidelity speaker at the show, the Disco4 with NFC pairing stands out without weighing you down.