Features: HIGH BRIGHTNESS AND FAR LIGHTING DISTANCE: strong illumination of 250LM, lighting distance reaches up to 26 meters, it's super bright. ADJUSTABLE LIGHT BRIGHTNESS: white: high / medium / flashing, red: quick flashing / slow flashing / always on, flexible to meet your different lighting needs. UNIQUE OPENING DESIGN: with two notches on both sides of tail light ensures wider lighting angle of 240 degree side light and larger lighting area. EASY INSTALLATION: with adjustable straps, it's very quick and convenient to fix the light on or take it down from any place of handlebars of various bicycles. HIGH SOUND VOLUME LOUDSPEAKER: sound volume reaches up to 120dB, it's loud enough to warn vehicles such as trucks, buses, cars so as to ensure road safety. USB RECHARGEABLE: provided with a USB cable, it only takes 2.5 hours to fill up the front light through any electronic products with 5V output. SUPERIOR AND WATER-RESISTANT: made of aluminum and adopting anodic treatment process, so the rear light is high quality, durable, heat-resistant and water-resistant.