I like that you can control them through Bluetooth with your phone or tablet. They are suppose to last two hours at 50% output, I tested mine at 75% output and they shut themselves off after around thirty minutes due to overheating I think, they were too hot to hold onto. This was done indoors, they would probably do better outdoors where they had more airflow. They both were fine after cooling off and still had 65% charge left. They also have 7 different strobe settings and a slave setting that flashes automatically with a camera flash (haven't tested that yet). All in all a pretty cool little light (no pun intended).