Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worked for a month

The monitors were great when they were first purchased but after a month all we could pick up was static. We have moved the monitors from room to room, put them in different positions and still all we get is static, we can't even hear our baby when he cries. Eventually the static goes away and all you constantly hear is an annoying buzzing noise. I would recommend a different brand.