Very pleased with this item at first use. At next use, thought the unit had been left on and the battery had died, but discovered there is no compartment for a battery, or you have to take off the back which would probably void a warranty. It is advertised in specifications and elsewhere as having a battery. My instructions came only in Chinese, a language that I have never studied. After plugging in charging cord, it appears that the issue id that the sensor is defective/dead. After reading the other reviews, I don't recommend purchasing this product.
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