One thing I love about this device is the fact that it comes with an integrated rechargeable battery. This means that you won't need to buy additional batteries. Moreover, you can plug them into your computer or a USB wall charger to recharge. The battery's lifespan is ideal - I've managed to run it for up to 10 hours with no need to replace it. Overall it's a great device. Casio PX-780 is an excellent music player with a range of in terms of portability, functionality and portability that isn't found in other similar devices.
The sound quality is excellent (provided you use high bitrate MP3s as I do) and the built-in effects are great for altering the sound of your music. Even though it doesn't support advanced formats like FLAC and WAV, the player is still an excellent option for those looking for an affordable way to listen to the music they love. So if you're in the need of a new digital audio player, I would recommend looking into the Casio PX-780. It's a great player for the price and has features you will not find in other players.