Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good alarm clock but complicated to configure.

I've owned this clock for several years, buying it primarily because of its link to the US time-signal radio station, WWV, maintained its accuracy. Excellent features include long battery life, night illumination when needed, and a small footprint for travel. The single and the weekday alarms are nice. The loudness of the alarm increases as it sounds. The alarm pitch is excellent for my older ears; I cannot hear alarms on many electronic clocks (or watches).I found changing options complicated and unintuitive. Because months could elapse between these changes, I needed to consult the manual whenever I made them.Recently, its radio time-setting ability failed even though the WWV signal strength remains high. Bottom line: I'll buy the same model again.