... life:more ten years requency:4HZ ITEM: KLS11-KQ16B counter, Meter counter, mechanical counter, Step counterVery Stable quality/ Good price/6 wheels/1 ... cooperation. we are wilding and strongly on below products line: Electronic components include:Terminal blocks, connectors, buzzers, potentiometers, fuses & fuse holders ... to repay the society.KLS Culture: Serious Work, Enjoy Life Electronic COUNTER