The highly anticipated CMR-201 Rail Master Laser is an instantly activated universal laser sight for Picatinny or Weaver rail equipped pistols and rifles. The CMR-201 marks Crimson Trace's first universal fit laser sight and built with the industry leading quality, ergonomics, and fit. Factory sighted for accuracy to 50'. Just tap to turn on and tap again to turn off. Auto shutoff after 5 minutes to preserve battery. Runs for up to 4 hours on one 1/3V Lithium battery.