Twin high-output LED (light emitting diode) bicycle light set. Featuring ( COB) Chip on Board technology, allowing denser placement of LEDs for a brighter light with a lasting glow.This To-Be-Seen light is perfect for partially lit roads and paths. For those needing added security, this Radian locking mount contains internal hardware reqiring tools for install and removal. Compatible with most handlebars or seat posts. Headlight 85 Lumens with 2 modes of operation. Taillight 10 Lumens with 3 modes of operation. 5AAA batteries not included.