CAO Vision Limited Edition Humidor with Blue LED Excellent Condition w/Batteries. CAO vision Prana lighted cigar box humidor Measures 10 1/2 x 9 1/4 x 3 This cigar box/humidor has a digital hygrometer on thefront, so you can read the humidity without opening the box. Includes the batteries that run the hygrometer and also the box lights up the letters “cao vision ” in blue when you open the lid All white when closed. Light blue letters when open and lit.