I've been running this rear light for 7 months now and love it. For those that don't have room on their seat post, it will strap to the seat stay. Different modes for both day and night riding. Great side visibility.
Note: trim the rubber away from the micro USB connector - otherwise it's a tight fit and hard to get a good connection.
It has surpassed all my expectations.
https://www.amazon.com/dp/B07F7NY7DD...ing=UTF8&psc=1