Built-in wireless transmission, ZigBee signalLinear ball bearings for ten million times useAbsolute encoder, the original data remains after power offReading in digit and analog. Button function: data output, tolerance, data preset, data hold, measuring direction change, max. /min./TIR, power off time, on/off, mm/inch, adjust resolutionPower: rechargeable battery, for 24 hours continuous workingOptional accessary: contact points, foot switch, wireless receiver