Instruct: Classify an Amazon review into positive or negative sentiment.
Query: UNRELIABLE

I purchased this pedometer several months ago and it worked for a few days then quit. I changed the battery. It still did not work consistently - often the screen would go completely blank, the reset button did not work and the only way to have any numerics come up was to reinstall the battery. Finally I returned it to the manufacturer and they sent a replacement. Same problems. Yesterday it worked for an hour then quit - blank screen. Today I reinstalled the battery and got screens of non-numeric (or partial numeric) characters that were scrolling at high speed.I've asked for a refund.