Subwoofer speaker Suitable for computer,laptop or other. Can be separate two part Use by USB liner or transformer. Bluetooth 2.0 speaker ... /Output: STEREO / --Satellite Line: Length ---Function Spec.: Bluetooth, VOL+/-, POWER,USB OUT(CHARGER), AUX IN,Play/Pause,MIC About USWe are ... R&D group.esp. the Novelty gift,Promotion gift ,LED USB flash drive, Speaker act.Payment Term*For sample, you can ...