The Lezyne Femto Drive is an ultra-compact, aluminium-bodied cycling light that comes in matching front & rear sets. The Femto Drrive lights are super popular due to their small size which makes them ideal to be used as backup lights, or secondary lights through the winter months. The simple strap bracket makes the Femto Drive easy to attach to your bike & they can be mounted in a variety of positions. The Femto Drive lights are powered by the widely available CR2032 batteries & they come with 1 solid & 4 flash modes. Lezyne Femto Drive Front Light MAX LUMENS: 15 WEIGHT: 31g BATTERY: CR2032 (included) Lezyne Femto Drive Rear Light MAX LUMENS: 7 WEIGHT: 31g BATTERY: CR2032 (included)