This.30-30 WIN Cartridge Laser Bore Sighter features precision accuracy. This bore sighter is a fast， reliable and durable gun zeroing and sighting system. Precision accuracy Reliable and durable Fastest gun zeroing and sighting system Reduce wasted cartridges and shells Compact and lightweight Easy to pack and travel Laser wavelength (nm): 632-650 LED type: Visible red laser Power: Less than 5 megawatts Power: <5mw Battery type (AG5)- 2 (AG3)- 3 Battery life: One (1) hour Range for sighting: 15-100 yards Dot size: Two (2) at 100 yards Operation: On/off end cap Construction: Brass Temperature: 10-50