1) 3.5 mm jack 2) Stereo sound 3) Two ear plugs 4) For use with: J110a, J120i, K200a, K220i, K320i, K550i, K750i, K790a, K810i, K850i,M600i, P1i, P990i , S500i, T250a, T650i, W200a, W300i, W580i, W600im, W610i,W660i, W700i, W800i , W880i, W910i, W950i , W960i, Z310a, Z520a, Z520i, Z710i,Z750 producing area:china