Front: 7 Lux, output from a single Japanese LED; Modes: Constant and flashing; Up to 100s run time using 2 AA batteries; Intuitive mounting bracket, installs without tools; Rear: Visible from up to 1 mile with a single 1/4 Watt Japanese LED & 2 further LEDs; Modes: Constant and flashing; Up to 100 hours using 2 AAA batteries; Mounts to belt clip, seat post or seat stay; Tough construction withstands extreme weather conditions; Batteries included in both; A great value set of front and back lights from Smart that will keep you seen and safe when you're cycling in the evening.