Fenix Bike Light - BT20

NIGHT-SPLITTING ON BIKE POWER When long-reach lumens matter, the BT20 rides where few can go. With both safety and freedom in mind, the DUAL DISTANCE BEAM SYSTEM gives the BT20 the potential to serve as a single-light solution for many riders. Max 750 lumen output from single use or rechargeable batteries Multiple brightness levels housed in an aerodynamic head Simple operation including battery enclosure attachment and cabling Limited Lifetime Guarantee from Fenix Light US  Size: 2.7" (Length) x 1.7" (Width) x 2.2" (Height) Weight: 5.5 ounce weight (excluding battery and accessories) Accessories: BA4C battery case (for use with 4 CR123A or 2 18650 batteries -- not included), three o-ring mounting straps, extension cable, battery case protective sleeve, helmet mount