I bought one of these amps for myself when I was having to teach with mask inn and with kids spread out. I didn't have to tell for the whole room to hear me out when we were outside, and turning it on and off clearly differentiated when I was speaking to an individual student or small group vs when the whole class needed to be listening.
ZOWEETEK Voice Amplifier, Portable Voice Amplifier Microphone Headset and Waistband, Personal voice amplifier, Mini voice amplifier,Voice amplifier for Teachers, Elderly,Coaches, Tour Guides, Training https://www.amazon.com/dp/B08R8ZQ4KS/ref=cm_sw_r_cp_api_glt_fabc_XZPBVSQ313T2MF2QJNNJ?_encoding=UTF8&psc=1