This lamp is easy to install and won't take up much space, bring you safety in dark environment and won't bother your cycling. Features: Built-in fine quality large capacity battery, USB recharging design, you don't need to worry its battery. IPX5 waterproof level and can adapt to various complex outdoor environments. Easy to install and disassemble. Battery indicator reminds you to recharge in time. Four modes can be adjusted. Light weight and mini size, easy for carrying. During riding, you can use it emergency recharging your mobilephone. Made of fine quality aluminum alloy, quick heat dissipation, not falling and practical. Large angle lighting range. Specifications: Type: EOS610, EOS620, EOS630, EOS640 (optional) EOS610: Beads: TG3 * 3 Battery: 3.7V, 2000mAh Lumen: 900lm Light color: white Item color: black Material: Aluminum alloy+plastics Item size: 91 * 41 * 30mm / 3.6 * 1.6 * 1.2in Item weight: 145g / 5.1ounce Package size: 163 * 100 * 42mm / 6.4 * 3.9 * 1.7in Package weight: 208g / 7.3ounce EOS620: Beads: TG3 * 6 Battery: 3.7V, 4000mAh Lumen: 1400lm Light color: white Item color: black Material: Aluminum alloy+plastics Item size: 151 * 41 * 30mm / 5.9 * 1.6 * 1.2in Item weight: 236g / 8.3ounce Package size: 197 * 100 * 42mm / 7.8 * 3.9 * 1.7in Package weight: 298g / 10.5ounce EOS630: Beads: P9 * 1+XPG * 2 Battery: 3.7V, 4000mAh Lumen: 1200lm Light color: white Item color: black Material: Aluminum alloy+plastics Item size: 104 * 45 * 38mm / 4.1 * 1.8 * 1.5in Item weight: 200g / 7.1ounce Package size: 163 * 100 * 42mm / 6.4 * 3.9 * 1.7in Package weight: 259g / 9.1ounce EOS640: Beads: P9 * 5 Battery: 3.7V, 8000mAh Lumen: 2600lm Light color: white Item color: black Material: Aluminum alloy+plastics Item size: 164 * 45 * 38mm / 6.5 * 1.8 * 1.5in Item weight: 325g / 11.5ounce Package size: 197 * 100 * 42mm / 7.8 * 3.9 * 1.7in Package weight: 381g / 13.4ounce Packing List: 1 * Bike Light 1 * Bracket 1 * Antislip Mat 1 * Bracket Strap 1 * USB Cable