Designed to run on 3.3V to 4.2V , making it compatible with standard lithium-polymer batteries. Common Applications User’s Manual - FCC Report
Build a Bluetooth Boombox Speaker (from Scratch) - Instructables Bk-m33-bt-v2.pcb
Capable of handling Bluetooth audio streaming (A2DP) and often includes support for FM radio and USB/TF card playback. Designed to run on 3
