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Hi Simon, thanks for your inquiry. Unfortunately, this is not a public specification that we disclose at this time, and here is why. Output wattage tell an incomplete story when judging a speaker’s performance. To be more accurate you would need to know the watts, the dB rating, and frequency range (Hz) of all the speakers in the unit. Also, the distortion (THD) rate and the number of speakers driven for the rating of watts presented on the box. Yes, those things are not standardized. Then do some math, and you will get a general understanding of the loudness and range of the speaker in question. Then do that for all the different companies and you could compare with specs, though even if they were equal, they may sound different due to processing. And the charging requires DC 5 V/Max. 1.5 A (Max. 2 A in total for 2 ports*) *The feed current is automatically adjusted in accordance with the number of connected USB devices and the sound volume of the unit. Regards, Sam
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