Zoom LiveTrak L-8 Podcast Recorder, Battery Powered, Digital Mixer and Recorder, Music Mixer, Phone Input, Sound Pads, 4 Headphone Outputs, 12-In/4-Out Audio Interface, Built In EQ and Effects | Reverb
AG06MK2 6-Channel Loopback Audio USB Mixer - Yamaha USA
6-Channel Audio Mixer DJ Controller 7 Band EQ, 16 DSP Effects & USB | Boytone
Mobile mixers (battery powered, passive) - Equipment - lines
Best Battery Powered Audio Mixer Wired or Wireless!
Pro 4 Stereo / 8 Mono Audio Mini Mixer effect reverberator 1/4 Inputs and outputs - battery powered, or use optional AC adapter - AliExpress
MXL MM-4000 Mini Mixer+ Portable Analog/Digital Audio Mixer - The Sound Parcel