Vifly Finder 5V / 4.5-5.5V Super Loud Buzzer Tracker Over 100dB Built-in Battery for Flight Controller RC Drone Model Part Accs wifi fpv please kindly re-sent your message

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The internal resistance of 3 battery capacity are closer will be better

UART3 output 3

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Antenna Status Detection and adjustment

Vifly Finder 5V / 4.5-5.5V Super Loud Buzzer Tracker Over 100dB Built-in Battery for Flight Controller RC Drone Model Part Accs wifi fpv please kindly re-sent your message5V Specification: Brand Name: Vifly Item Name: 5V Buzzer for RC Drone Built in Battery Size: 23x13x16mm Weight: 4g Features: A Working Buzzer after Battery Ejection VIFLY Finder is designed with a built in battery that gives it the power to sound an alarm even after the quad battery was disconnected. VIFLY Finder charges itself simply by being plugged in. Much Louder than Standard Buzzer To easily find the crashed quad in long distance, VIFLY Finder