Battery life: Product life is approximately 16-20 hours or more. In general, it will serve you for some time. For two business days with 8 hours, mp3 will not show a battery warning until the 2nd day. At least 16 hours, even longer with regular use. Sound quality: As far as I know, the device does not affect the sound quality, but the MP3 format itself does. (320 is one of the best quality standards) No, this device does not play FLAC files. Only your most popular MP3 formats that work on Windows. For training: I haven't tried it in the gym, but I've taken it for long walks. As long as the MP3 player's rear clip is attached to something secure, the product will stay in place. As for running, I'd be a little cautious; to go for a walk? are you all right? The silicone material, including the case, gives you a good chance of getting sweaty, greasy fingers, skipping a track, or squeezing the device out of your hand if you press incorrectly. For office/work: I work in an office with no floor access, Bluetooth, devices with internet access. I've been using this product daily for several weeks and it's a basic MP3 player. That's enough for at least 2 shifts of 8 hours each, maybe half of the 3rd day. Device Mechanics: Shuffling is kinda weird. let me explain. If you have a tracklist of 100 songs on this device, you will randomly hear some of those songs. For example, song 47 out of 100 will most likely appear "accidentally" among the other 99 other tracks. I don't understand why this is happening, but that's what I caught. When shuffling, guide the device's directional keys (left and right) to a random song. This means that the song you are listening to cannot be replayed if you have already finished/skipped it. Instead, you'll find another random song in its place. Another issue I would like to point out is that the navigation bar has no edges, ridges, or indentations. Giving navigation to a device without eyes can be a bit difficult. I used the input cable for my headphones to find out where the mp3 player is now. It can also be confusing if you sometimes pop up, turn, jump forward or back without looking. Volume control: simply hold up to increase volume and hold down to decrease volume. Simply pressing up or down repeatedly does nothing.
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