Yi 4K Action Camera works well. A little touck maintaining WiFi connection
I think I'm going to be using this camera a lot. Extensive controls are easy to read in good clear english from the sreen or remotely by WiFi for your cell phone. Very handy for set and forget shooting situation in tight spaces or remote locations. Battery life is excellent, camera controls and extensive and easy to set and adjust. Camera writes MP4 video files accurately to a fast Class 10 U3 64 Gig Micro SDXC (sold separately), simultaneously writing both Hi res as well as Thumbnail clips in 11 min +/- clip-segments they can later be joined into seamless video files of any lenght in post production. Easy to learn.