Used a few times with the DJI OSMO Action 5 Pro. It's a genuine product purchased from Amazon. The original box is not included, so it will be placed in a ziplock bag and shipped with simple packaging via Nekopos. It seems to be a specification that the initial volume becomes loud if you don't press the record button after turning on the power button (pressing the record button immediately is not allowed). Top Highlights Compatible Devices: MP3 Player Product Use: Camera Connector Type: AUX Color: Black Product Dimensions (L x W x H): 28 x 19 x 22 mm Brand: DJI The 3.5mm port can only be connected to a microphone and cannot be used for headphones. The Type-C port can only be used for charging when the 3.5mm port is connected to a microphone. Compatibility: Osmo Action 4, Osmo Action 5 Pro Weight: 50 g Size: 28.14 x 22.23 x 18.91 mm (L x W x H) Can be used for 3.5mm microphone audio input, recording clear and high-quality audio even in fast-paced scenes like a motorcycle ride.