Doctor Recommended! Lice Knowing You© Knock-Out Lice Removal System is a proven safe and effective way to eliminate lice and nits just like the professionals! The Knock-Out Lice Removal System contains Lice Removal Knock-Out Serum, Lice Removal Knock-Out Mousse, a Knock-Out Lice Comb, a Magnifying Glass, a video tutorial and step-by-step instructions, in both english and spanish, on how to remove head lice. The contents of the kit can be used for multiple treatments. Give a one, two punch to lice – and knock it out for good!