Buyer beware. You must own a special battery charger to use it. The $19.99 price is just for starters. The head apparently wears out frequently, so you are encouraged to purchase at least two to start.
I spent $41+, waited a month for delivery and got a unit I must charge on a special charger for eight hours before I can use it.
Pass this up; it is a rip-off! Nowhere in their advertising does it mention you have to have a special charger to charge it up. I have $41+ worth of trash. I checked out the warranty, and it will cost you more to return it than you paid for it.
Bottom Line: No, I would not recommend this to a friend
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