Portland Design Works is no stranger to making cycling accessories for the urban cyclist seeking functionality above all else. Following this function-first philosophy, the Portland Design Works Daybot USB Tail Light offers two distinctive LEDs that keep you visible to passing traffic during daytime commutes and late-night rides to the local pub. Easily mount it to your seatpost or seatstay with the included mount and bracket. Best of all, the light's USB-rechargeable battery plugs into any USB port for rapid charging at work, home, and school. The daytime LED is the brightest of the two lights and requires you to toggle through the settings until both LEDs light up. This mode gives you 100 lumens of pulsing light and 60 lumens of solid beam. Seeing less light is required at night, you'll find the night mode projects 20 lumens of solid, flashing, and pulsing light. It lasts much longer in night mode, ranging from 20 hours as a solid beam to an impressive 100 hours in the night pulse.