@forteller You can find apps for the phone that can use the phone mic, and the phone as the Bluetooth sender.The latency is the issue here, it is very confusing for a speaker to have your voice amplified next to you with the latency a Bluetooth usually gives, compared to wired or other quicker transmissions.Small wireless mics (like 2,4GHz) that output through minijack, into a "bluetooth" speaker with an aux cable is the most lightweight way to go, unless you just buy a small PA system.