This .45 CAL Cartridge red Laser Bore Sighter features precision accuracy. This bore sighter is a fast， reliable and durable gun zeroing and sighting system.Precision accuracyReliable and durableFastest gun zeroing and sighting systemReduce wasted cartridges and shellsCompact and lightweightEasy to pack and travelLaser wavelength (nm): 635-655LED type: Visible red laserPower: Less than 5mWSighting Range: 20-30yardsDot Size: 1.5" @ 100 ydsBattery type: L936Operation: On/off end capConstruction: BrassTemperature: 10-50Package included:1 x Laser Boresighter4 x Batteries1 x User Manual