JHE42B works pretty good. it has a backup battery as well in case your flight battery gets uplugged. there is a smaller version JHE42B_S if you want to search.

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https://www.amazon.com/Crazepony-Quadcopter-Tracker-Compatible-Controller/dp/B07H354WBH/ref=sr_1_38?keywords=fpv+buzzer+loud&qid=1556554108&s=gateway&sr=8-38