it’s theoretically extremely cool, but the mic is no bueno in my opinion. great for monitoring/acquiring bioacoustic data, but not so much for generating high-quality recordings. (it does record at 384, but the mic quality is subpar.) i had very high hopes. the ability to set timers, the size, the portability, etc, are great for a good portion of the work i’m doing at the moment. no externals; only writes to SD card (not to the usb port). but watch this company, as i’m sure all of the above will improve dramatically over time. i’m a big supporter of the product. if you would be interested i can sell you mine - I’ve used only twice, and in interior settings. DM me and we can work out a price.