BUTTON The massage comb has three buttons, the bottom one is the on/off button, the left button switches between red light and blue light, and the right button switches between three massage vibration modes. After starting, short press the switch button again to turn on the steam mode. ULTRASONIC : There is a liquid refill port on the back of the comb for up to 20ml of liquid. The first time you use it, you need to leave it for about 30 minutes to wait for the liquid to flow into the sensor. HAIR OIL APPLICATOR: The hair oil applicator delivers liquid precisely to the hair shaft for an even application and a vibrating massage to maintain comfort throughout the application process. Once activated, the liquid will be evenly applied to the hair in the form of steam. ELECTRIC SCALP MASSAGER: 3 kinds of 10000/min high frequency vibration massage modes, provide you with a soothing scalp massage. Use this scalp applicator massager in combination with serums and more. USE WITH: Scalp applicator comb is suitable for serums, nutrient solutions, etc. (This massage comb is suitable for adding water-based liquids, please do not add oil-based liquids. If you accidentally add oily liquids that cause clogging, you can add hot water to unclog it.) Colour:As Shown Material:plastic Package Contents: 1 x Multi-functional Comb 1 x Chinese and English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.