Used a few times. Operation confirmed. Batteries not included. Batteries used: 1 x Alkaline AA battery RGBWY-LED equipped By equipping Y / W LEDs, more vivid colors than ever are achieved. Dual memory function You can freely customize the color by selecting your favorite number and order of colors from 15 default colors. You can save 2 types of memory patterns (+ default pattern). Hot Button With the switch on the back, you can jump to your favorite color with one push. 15 default colors This function can only be used with the main unit operation. The color changes every time you press the switch. Illumination part size: H150mm (Shining Standard Tube) Total length: H250mm Item type: Penlight Ruifan Japan