This headlight functions during the day and at night.
The lights are very bright and produce up to 500 lumens on the white light and up to 300 lumens for the red light. The headlight is also made of military grade waterproof silicone. You can mount it to your bike with a magnet. It's powered by an internal battery and can be charged via a micro-USB port. The lights go infront and the rear of the bike to make sure that you light up and can be seen from any direction.