This intelligent phone holder has a powerful 4,000 mAh battery that provides up to 12 hours of lighting on a full charge. Ride safer with the Integrated 130dB remote-control electric horn to alert traffic and pedestrians that you're approaching. Keep your phone charged along your ride with the built-in USB powerbank. Three lighting modes offer up to 400 lumen continuous light, giving you plenty of options for a variety of riding conditions. This phone holder fits all phones up to 6.5 in (16.5 cm) wide and weighs just 250 grams.