Thank you for viewing. RST-SL02BK Beam Angle Adjustable Type Edison Smart Spotlight Black For Duct Rail LED Integrated With Dimming and Color Temperature Adjustment Functions Set of 2 Purchased new around the fall of 2023. I had them in my garage, so I didn't actually use them much, and the operating hours are far less than if they were used indoors. I was using 10 of them, but the router I'm using only properly recognizes up to 8, so I removed them. Both the dimming and color temperature adjustment functions, as well as the beam angle adjustment function, work without any problems. There is no instruction manual, but you can view it for free by searching online. If you have any questions, please feel free to ask.