This .270 wsm Sightmark laser bore sight comes with batteries and a carrying case with the Quality sightmark red laser

wave length 632-650 nm

class III a

Batteries 3xAG3 included ,can use 2x  AG5

Battery life <1hr continuous use

Sighting Range 15-100 yds

dot size  2" @100yds

Simply chamber the boresight like your regular round.