... ,space silverMaterialStainless steel ChargingBuiltin Li-ion battery rechargeable with USB power Product sizeD60mm *H50mm The built-in 3.5 mm audio jack ... play, identify USB automatically, USB Powered and signal directly 3. Full-digital processing, no signal lose by USB transmission, ... , tape recorders, learning machines, radios and other audio device 7. All made of metal. NOTE:We have two versions of ...