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SPEAKER'S FUNCTIONAL PARAMETER Out put: RMS 3.20 5W THDs10% Frequency response: 100-18000HZ Signal and noise ratio of power amplifier: 280dB 3inch(external diameter76.2mm) magnetic resistant 3.20 Loudspeaker: Power supplied: 5.0V/1A Battery capacity: 1200mAh WARNING LIMITS OF RECHARGING BY THE CHARGER OF HANDEST. THE DURATION OF CHARGING IS 1-3 HOURS, THE PERIODOF PLAYING IS 1-3 HOURS. MADE IN CHINA