Luckily the mouse is always on but I have a new keyboard and they use the same type of IR dongle. To configure the mouse to use it, you must power cycle the mouse. I have taken it apart a few times over the years as this is my favorite mouse for multimedia. The outer shell and battery have both been changed but the power toggle switch, I can not find a fix and trying to manipulate the function with the mouse open, it must won't recognize it. I figure if someone can help me it'd be here. So please reach out as this mouse is no longer in production and users want $300+ for them online. Which is ludicrous! I can update this with photos later but if you have any thoughts or questions, please reach out. Any input and hopefully a way to repair this would be greatly appreciated. Have a good one!