Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: sensor has extreme near vision- don't buy it

I am disappointed in this sensor. It only picks up motion when you are close enough to throw the light switch yourself!It even takes longer to see me then it would be for me to turn on the lamp myself so what's the point of spending 15$ on this?For $12 buy one called sensor plug that is white and red. It can see me from 30 ft away and snaps on quickly EVERY time.Also The sensor alarm feature on this sylvania sa135 is also a joke since it can't see me to sound the alarm unless I walk very slowly within 2 ft of it, and even then it is unreliable.