We have one that beeps when it comes across one in the hair. It's fantastic and makes de-nitting faster and easier. tho it can get tangled depending on hair type. Mine is really fine and curly and it didn't agree with my hair.
My sister's advice - don't use them with el cheapo or rechargeable batteries, as you may get enough power to make the noise, but not enough to actually kill the little beasties!
They are brilliant. When I was a kid I had, like, super nits or something, it was seriously disgusting. Everything my mum tried didn't work at all, they just lived! Eventually she was recommended a robicomb by someone so she bought one and finally they were gone. I had them for months, and the only thing that got rid of them was the comb.
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