Fits well. Not too heavy and holds charge for at least 6 x 1 hour rides. Better than an extra light on top of your helmet at night and not as cumbersome and heavy. Need to do more riding to determine full range.Very visible at night and a worthwhile safety addition for a bike rider.
Works as indicated, but lights are hard to see in daylight from a distance.
Also finding it difficult to get the braking action to work using the App. Seems to be very sensitive. Either won't work at all or all rear lights on all the time, meaning battery is flattened in 2 hours.