Say "Good Bye" to expensive hair salons that charge a fortune to change your hair color! Now you can dye your hair at home fast, safe and easily. The color control system distributes color with precision and ease. You'll be amazed just how fast and easy it is. 3 Step Process: Pour hair dye into brush head, Press button to dispense hair dye then brush root to tip to evenly distribute hair dye and presto: professional results at home in half the time. Takes 2 "AA" batteries (not included) Each measures 10"L