Sent back without trying and sorry now cuz you get what you pay for.
The price is high but after replacing it, I began to regret it. The one I purchased after I returned it was a pain. The mouth piece was difficult to put on the unit. Teeth whitened in most places but missed some no matter what I tried. This one plugs in. Simple. Being a prime member I hope they will sell it for that reduced price they sold it to me then. Easy to return,fast refund. You get what you pay for.  Gotta a feeling it’s going to be great.
Rating: 5 stars