Series 2 Tour Flag Lock with Pulse Vibration emits short vibrating pulses to confirm lock onto target, not what's behind it Measure targets up to 800 yards away with an accuracy of +/- 1 yard. Adjustable EZ Optic Focus for high definition viewing Water resistant construction No slope technology makes this device eligible for tournament legal play In the Box Series 2 Rangefinder Hard shell carrying case Microfiber cleaning cloth CR2-3V battery