Prospera s massage hairbrush is fashionably designed to improve scalp health and hair appearance. Details- Powered by alkaline 2AA batteries (not included), it s safe to use routinely. - It has 108 replaceable teeth, washable to keep them clean. - Far infrared light wave to treat hair, and also, help to reduce dandruff.- Vibration massage to improve scalp blood circulation, make hair more beautiful - Two operation modes: vibration and infrared massage for you to choose from. Infrared for scalp treatment and blue light helps follicle growth.Product Specifications- Replaceable and washable nylon comb - Vibration: 9700RPM - Infrared wavelength: 660nm- Blue light wavelength: 470nm - Made from green material - Measures 9""x 2""x 1.5"", - Weighs 5.2 oz