Instruct: Classify Amazon reviews into positive or negative sentiment
Query: An excellent smokeless ashtray

I have tried a few in the past number of years, however, I can unequivocally state that this particular one works exceedingly well.One suggestion: I believe that I read somewhere that this unit, with the batteries removed can be washed. Don't do it. I did and it made the noise level much louder.Otherwise, this unit is quiet and does all that is promised. It is certainly worth the price and I highly recommend it without reservation.