To be honest, I bought it as a registrar. Tired of lawlessness on the roads, etc. Before that, I saw a GOpro from a friend, I don’t know which one, but I liked the idea itself. I decided to buy an analogue, after reading a bunch of information on the internet and chose 4000 with Wi-Fi. Arranges everything. It shoots very well, takes pictures too. I have not tried it under water yet, this year June is not June at all. So, I dabbled in the bathroom and filmed a turtle in an aquarium. As for the sound - I ordered another case for aliexpress, it will come - I will drill a hole cleanly in place of the microphone. It's not all as bad as it's made out to be, though. People, reading many comments, I am amazed at your intelligence. If you want GoPro, get GoPro. The price is vastly different. For an ordinary washer, the SJcam 4000 is an excellent machine. Nothing superfluous and a bunch of priblud in the kit. Well, the pros stand accordingly. And yes, I have never tried Wi-Fi yet))) I think I overpaid in vain))) I will add a review. 2022, The camera works with a bang. It hangs permanently in the car as a registrar, in the summer we swim and shoot underwater with the whole family. I use Wi-Fi to pair with an iPhone to transfer photo and video. A bunch of stray items from the kit are still in the box. I use aquabox and charger. And that's it. Outcome: The camera justified itself.