This amp has really sound quality , neutral side and wide soundstage . It could have a little more bass with bass boost switch but no complains here since i do prefer a neutral sound to get the natural performance from my iems. Battery is great , i still haven't charged it yet . I like the volume knob it is very easy to adjust . The output could be a little easier to use. For example when using my pk1 it demands some force to put it , and get it out of output . The size is portable but could be less bulkier. These are just very minor details but the...

This is an amazing ultra portable amp. I paid 99$ for it and couldn't be happier.    Sound This amp has one of the best soundstage i've heard for this price , if not the best. The soundstage can easily improve with the switch ON . The detail is really good , and with the bass boost switch which also boosts treble a little bit , the detail and clarity is even more improved . There is another switch as well for higher impedance cans to give more juice but i rarely use it for my IEMs.    Portability Ultra portable , this amp is extremely small and...