Fans of Streamlight’s TLR-2 will find the same great features on TLR-2S Rail Mounted Light with an added strobing function. The powerful light uses two 3-volt CR123A lithium batteries with 10-year storage life. It uses the C4 LED with blinding beam (TLR-2: 135 lumens, TLR-2s 160 lumens) with optimum peripheral illumination. This means it will not break or burn out. Its rail grip clamp system securely attaches/detaches quickly and safely with no tools required and without putting your hands in front of muzzle.