This solar powered tail light for bicycles is the perfect answer to night time riding. Whether your long distance biking or watching the kids in the street every biker should own one for safety reasons. 1. Streamline design and unique dynamic. 2. No batteries, environment-friendly and economic. 3. Charge under sunlight. 4. Two LED bulbs last for 4-8 hours. 5. Easily install on the chain stay, adjustable size. 6. Flash Model: swift flash, pausal flash, continuing light. Type: Bicycle Tail Light Type: Tail Light Tail Light Size: 70 × 55 × 20mm / 2.76 x 1.17 x 0.79inch Hoop Diameter: 22-30mm/0.86-1.18inch NetWeight: 75g/ 2.65oz Features: Solar Powered Light Color: Red Light Light Bulb: 2 LEDs Mounting Placement: Seatpost Appearance color: Black + Red Mode Arrangement: Quick Flash, Flash and Constant