Cyclists, stay safe and visible with these powerful USB rechargeable bike tail lights! This 2-pack gives you lights for multiple bikes or a backup for when you need it. With 120 lumens of brightness from 10 LEDs, you'll be seen from a distance, day or night. The built-in 600 mAh lithium-ion battery recharges via USB - just use the included cable with your computer, power bank, or wall adapter. The IP64 waterproof rating means these lights can handle rain, snow, and dust, so weather won't stop your rides. Choose from 7 different lighting modes including high, medium, blink, pulse, SOS, and left/right flashing patterns to suit your riding conditions. The swiveling base adjusts between horizontal and vertical positions to fit your bike's seat post perfectly. Installation takes seconds - just wrap the stretchable silicone rubber strap around your seat post for a secure fit that works on any size. The one-touch button makes mode selection easy even while riding. Whether you're commuting in traffic, riding trails at dusk, or just want extra visibility on group rides, these lights provide that crucial safety margin. The 2-pack value means you can keep one charging while using the other, or outfit multiple bikes in your household. If you take cycling safety seriously but want convenience without buying batteries constantly, these USB rechargeable tail lights are absolutely worth the investment. Ride safer and smarter with these bright, reliable lights!