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Fiio's limited edition, E12 DIY version comes with swappable amplifier components to allow users to mix and match for ideal sound combination. E12DIY comes with a high voltage, low internal resistance power circuit, with dual 11V rails (+/- 11V); dual balanced power supply design eliminates the need for coupling capacitors, avoiding loss of audio frequencies and raising the dynamic range. High capacity 9.7Wh (880mAh/11.1V) Li-polymer battery comes with smart charging circuit that adjusts charging current dynamically according to the connected power supply's current ability.