Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Handy little device

This device is quite useful. I have already unplugged several electronic devices or at least changed my setup to save a little wasted power. As others have said, it would be nice if the LCD worked when it was not plugged in so you could review data and if it had a backlight. However, those features would drive up the price and not really change the functionality of the device. Great product.