I use nomadic almost 3 hours per day Momentum Seinnheiser helmet on my phone. Or in the transport I had to turn the volume to about 90% to isolate myself from the outside and there .... pa ta tra .... more battery in 2 hours. So I bought the E12 FiiO Mont Blanc to relieve my phone and give him a battery life needed for making calls (it can also be useful for a phone). And then wonder, the volume on my phone is just 30% and it rocks. More dynamic, no degradation in audio quality for a real treat. Congratulations Fiio. Only downside .... but easy to counter .... is that when the phone searches the network means the bipbipbipbip in the helmet and that's infernal. So, with a jack-jack cable 50cm, we put the amp in a pocket and the phone in another, and this is happiness.
If in doubt, do not hesitate you will not be on it.
