Aluminum alloy + PCB material, andwriting / drawing / touch screen / shorthand function, 145 mm long, 9 mm in diameter and 1.45 mm tip, micro USB charging port, powered by in build battery, up to 8 hours continuous latency-free drawing and writing, 140 mAh li-polymer battery, iOS / Android / Microsoft device / iPad / mini for iPhone / Samsung Galaxy / Nexus / LG G Pad / HTC and other touch screen pencil used.