Multi-Fuel: Uses two (2) CR123A lithium batteries (included); also accepts one (1) Streamlight SL-B26 protected Li-Ion USB rechargeable battery pack (not included); TEN-TAP programming allows for selection of three different operating programs: 1) high/strobe 2) high only 3) low/high; Integrated rail clamp attaches to MIL-STD-1913 (Picatinny) rails; Easy to attach, secure mounting; Durable, anodized aluminum construction with impact-resistant tempered glass lens; System includes remote pressure switch, Jack-Cap tail switch, remote retaining clips, double-sided tape, zip ties, and M-LOK mount