Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Do not buy - manufacturer site not available/ device cannot be activated

This product requires website activation - the website is no longer viable. Useless - have tried to get around it by going to sites that upload data from the device but without the primary site activation, it won't communicate. What company would ever design a product that wouldn't work without online registration? What if I didn't want to use their site to monitor? Very disappointed.