Leds on the case, in the case, on the motherboard, on all the fans, on the keyboard, on the hard drives, on the memory, on the monitors, and yes on the mice. My insoles, trimmed to Size 8, were a tight fit. Most excellent slippers, bought for my wife, she likes them, they are well made , lovely colour, good price when purchased. These sandals are absolutely my favorite ever. I have given up trying all kind of troubleshooting that is publicly published on Microsoft tech forums. 5 which was offered but turned out to be an 11 or size 43. Ive always been a big, big fan of Master and Dynamic. So, Im on the fence about recommending. Im 58" and 150 pounds. They stick and stay put but if you want move things around all the time it is not ideal.