Featuresr advanced led bead offers high illumination low power consumption and long lighting lifer usb rechargeable bike light with built in 330mah lithium battery charges from any device with a usb port only takes about 2 hours to full charge and supports long working time about 4 12hours continuouslyr 3 lighting modes including steady mode circle flash and pop flashr mode memory function it starts with the last mode used when the light turns onr charging indicator turns red when ch