I have the original O-Bulb and the O-Bulb MC so when the new version came out with a motion sensor, I had to try it. I was pleasantly surprised to see how well the sensor worked. It can pick up movement in low lighting from about six feet and then the Low white modes comes on and stays on for 15 seconds or until the movement stops. I was hoping I could change the color that lights up from the motion season, but it only works in the Low white mode. The motion sensor only works if the unit is plugged in and charging. The newest O-Bulb can be turned on by pressing the top of it as long as it is sitting on a hard surface. All the O-Bulb MC models I have (four) cannot turn on that way. I contacted Olight about it since it was a feature in the original version that I liked a lot and was told the MC was redesigned and they did away with that option. However, I read online and saw some Youtube videos where people have the MC version and they CAN turn it on by pressing on the top of it. Perhaps a design change by Olight? I am happy to confirm, the newest version with the motion sensor CAN turn on by pressing on the top. One negative on the MC-S is the Challenge Mode. Olight instruction manuals can leave a lot to be desired and the description of this mode is a perfect example of that. The MC and MC-S have a Random Mode that offers a rotating rainbow of colors, but in the MC, it only last 30 seconds. In the MC-S, the duration can be increased from its 30 second base by 10 second increments by passing "levels." Once 100 levels are passed, the duration is unlimited, just like the other color modes. The instructions do not do a good job at all in describing what levels are, let alone how to pass them. I contacted Olight several times and have not been able to get a clear and detailed explanation as to how the Challenge Mode works and how to advance in levels. I suggested to Olight they should have just made the Random Mode one of the regular modes and not last only 30 second or make a game out of how to increase the duration.