Amazon.com: Bose S1 Pro Portable Bluetooth Speaker System …

Monitor Mode To use the S1 Pro as a personal floor monitor, place it on the ground horizontally, in front of and pointing toward the performer. Tilt the loudspeaker onto its side edge. … Plug in the AC power cord or use battery 3.) Connect audio source. If using a guitar or microphone, set the ToneMatch switch to the appropriate setting.

https://www.amazon.com/Bose-Bluetooth-Speaker-System-Battery/dp/B07BLZX73S