685i

Product: Sennheiser PMX 685i Sports Eearphones Price: 3,000 shipped Date of Purchase: Oct, 2015 Condition: 4/5, sparsely used Remaining Warranty Period: consider it none, as couldn't find the invoice. will update this if I find it. Reason for sale: another model purchased & being used now...

i need to buy running headphones by sennheiser.. i am confused between the ocx and pmx series and their 680 and 685i versions.. please provide some assistance..