TritonAudio Big Amp Active DI Box & Instrument Amp
It has a 1/4" female jack input which accepts signals ranging from the pickup of an electric bass or (acoustic) guitar to the line-level output of a synthesizer. BigAmp's low noise class-A amplifier provides high-end amplification and converts the instrument output signal from unbalanced to balanced.
Bring your own high-quality DI everywhere. No hassle with batteries because BigAmp's circuit is powered with 24v/48v phantom power. The small form factor combined with the ease of use makes that every touring musician should have a BigAmp in their case or gigbag.