This product is a bicycle tail lamp, which is easy to install, with 7 light modes adjustable, and safer to ride at night. Features: There is a 2835LED white light bead with high brightness, and 10pcs 3014LED red light beads with multiple light modes to switch freely. It can be used as taillights, headlights, and flashlights. Seven modes can be switched with one button, making it convenient and quick to operate. USB rechargeable design with 250mAh capacity battery, you don't need to worry its battery. IP64 waterproof and dustproof, not afraid of the impact of adverseweather such as rain on the bike light. Compact size and light weight, cycling without burden. Easy to install and remove. Specifications: Item color: black+red Material: PC Waterproof: IP64 Battery: 3.7V, 250mAh Item size: 45 * 38 * 30mm / 1.8 * 1.5 * 1.2in Item weight: 21g / 0.7ounce Package size: 111 * 72 * 45mm / 4.4 * 2.8 * 1.8in Package weight: 50g / 1.8ounce Packing List: 1 * Bike Light 1 * USB Cable