Streamlight 88089 ProTac Rail Mount HL-X Laser with CR123A Lithium Batteries - 1000 Lumens,BlackTen tap programming: choice of three operating modes: 1. ) high strobe; 2. ) high only; 3. ) low high High for maximum illumination: 1, 000 lumens; 270m beam; runs 1. 25 hours (CR123A); runs 1. 5 hours (Rechargeable USB) Low for extended run time: 60 lumens; 66m beam; runs 20 hours (CR123A); runs 23 hours (Rechargeable USB) Strobe for signaling or disorienting: runs 2. 25 hours (CR123A); runs 3. 25 hours (Rechargeable USB) Rail grabber is separate