... 4. Prompt & Low Cost Delivery Mini Speaker, Mini portable speaker , Speaker for USB, SD, MP3, Computer, ... Mobile Phone!SpecificationItemMultimedia speakerSpecial FeaturePortable, MiniSpeaker4ohm, diameter:40mmLine Input3.5 stereo audio earphoneWorking Timeabout 10 ... in use, while charging while playback; Blue light indicates that charging has been completed ...