Trek’s nifty Beacon Bar End Lights slide into your handlebars and have rear-facing red LEDs so you can be seen from behind. They come in Road- and Mountain-specific models and can be run in steady and flashing mode.
Run time: 30+ hours
2 AAA batteries are included.
The Road model has 1 LED per light and works with rear-facing handlebars.
The Mountain model has 2 LEDs per light and works with side-facing handlebars.