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Mini Speaker, Mini portable speaker, Speaker for USB, SD, MP3, Computer, Mobile Phone!Specification ItemMultimedia speakerSpecial FeaturePortable, MiniSpeaker4ohm, diameter:40mmLine Input3.5 stereo audio earphoneWorking Timeabout 10 Hours (medium volume, random music)Li Battery Capacity200mAHBattery Voltage3.7VBattery Charging Voltage4.2 5VFrequency Response130Hz 22KHzS/N Ratio≥90dbUSB power cordoptionalBattery Charging TimeAbout 3 HoursRating Power2WPower Supply InputMINI USB (5V/500mA)UseHome Theatre, Portable Audio Player, Mobil, laptop, etc.ColorOptionalRecharge 1. Via a computer's USB port 2. Via a compatible DC mains charger Tips: Red light indicates unit is charging while not in use; Orange light indicates charging while unit is in use, while charging while playback; Blue light indicates that charging has been completed or in offline status (not connected to a computer USB port). Music Source: * 3.5mm audio LINE-IN Simply connect your mp3 player, iPods, mobile phones via standard 3.5mm headphone socket. * USB Audio DSP (Digital signal processing) Technology Simply connect the USB cable to a PC, the computer will install driver software automatically. No 3.5mm line-in cable required, because there is a built-in digital sound card inside the speaker.