Reddit reviews Wireless Voice Amplifier 10W 1800mAh Portable Mini PA Speaker with UHF Wireless Headset Microphone Hands-free Rechargeable Classroom Microphone for Teachers Tour Guides and Presentations
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Something like this? https://www.amazon.com/dp/B07NWCLJSS/ref=cm_sw_r_cp_api_i_TAMNDbTPJP0QY
I assume this isn’t waterproof but some searching (or using a ziplock bag) may provide results.