Bright light that flashes or solid on. I like how you can change from red to white so it can be used on the front or back of bike.
They are super bright, i bought them as a present so I can't say right now how long they will last when charged. It says 'blue lightning' on the bag but it is white light (just as I ordered), not to be confused. Tip-you have to long-press to switch off.