FiiO A5 Portable Headphone Amplifier with Extreme Audio 3.5mm Stereo to RCA Cable Aluminum body built to withstand wear and tear. Includes E12 headphone amplifier, High quality 3.5mm stereo to RCA connector included Speaker sound field simulation to lessen the "in-head" sound of headphones 22V high voltage supply with 850mW maximum output power for larger headphones Charging indicator blinks according to how long charge will take depending on what it is plugged into Output Power- &gt; 880 mW @ 32