Cygolite Expilion 250 USB Li-Ion One-Piece design High-Brightness LED Bike light 2nd Generation One-Piece Design (250 lumen LED output). USB Rechargeable Li-Ion battery, handlebar and helmet mounts. Rechargeable Quick Release Li-Ion battery (3 to 6 hr run time) USB Rechargeable with dual color charging status indicator High-Med-Low-Daylight flashing-Walking-SOS Modes Handlebar and helmet mounts included