Instruct: Classify the given review into positive or negative sentiment.
Query: Unreliable. Cryptic user interface

My experience with this product:* User interface is not intuitive. Each time the battery ran down, the manual had to be studied to determine how to reset the product, which loses all memory of previous user preferences when batteries were changed.* One of the side buttons completely failed, so I had to take the unit apart and manually "short" one of the switches to operate it.* It frequently failed to detected the atomic clock wireless signal.* The wireless connection to the separate temp sensor eventually failed completely.When it worked, the form factor was very nice (low profile, reasonably easy to read).