BTR13 Bluetooth Headphone Amplifier with LDAC, aptX Adaptive, aptX HD, AAC (Dual CS43131 3.5mm Unbalanced & 4.4mm Balanced Output) (Blue)

Easy to use. Just be careful to select English when turning it on for the first time. I accidentally selected Chinese and had to do a factory reset to get back to English. Took away one star for the iOS app being not so good. If you want to update the firmware you should do so through the android app only.

Actually really good! It's even better than the more expensive BTR 15, which has a lot of problems this doesn't.

Once set up properly, with a nice eq using the Fiio control app, this sounds fantastic. Battery life isn't great though, I'm getting 4 hours on average - with moderate volume levels. I've reset - I'm on the latest firmware, I've tried different iems, 3.5 and 4.4 cables and made no difference! It's a pity the fiio music app hasn't been updated to include it as well, as that would mean less apps on the phone.

So. I can honestly say, I don't use this thing. My phone battery is trash most days so I use a Mp3 player to listen to my music. And since the bluetooth works on my mp3 player I haven't had a use for this thing though I did test it and it does work, I've mainly used it as a dac for my laptop. I did use it for my phone and it sounds good. And the signal doesn't drop out when I walk out of the room or across the hall. That's the only thing I would say was wrong with my BTR15. The BTR17 tends to give me trouble too and while I haven't tested this thing extensively I can say my unit works with everything I threw at it. It also has a built in clip. It feels cheap but now I won't be afraid to drop it if I ever decide to use it outside of the house with my phone. I used it on my Mp3 player and the volume was so low on bluetooth and you can't use it wired so to tell you the truth I probably should've sent it back but I'm hoping to give it more of a purpose in the future.

Downright delicious! I used the EarStudio ES100 from Radsone previously for perhaps 7 years, and while the FiiO's battery life is significantly shorter, its audio quality is significantly better. It provides more power to the driver, so it sounds way nicer, even at neutral EQ settings. You really don't need to play with the EQ to enjoy this product.