... Cost Delivery Mini Speaker, Mini portable speaker , Speaker for USB, SD, MP3, Computer, Mobile Phone!SpecificationItemMultimedia speakerSpecial FeaturePortable, MiniSpeaker4ohm, ... is in use, while charging while playback; Blue light indicates that charging has been completed or ... 3.5mm headphone socket.* USB Audio DSP (Digital signal processing) TechnologySimply connect the USB cable to a PC, ...