Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Peter

We have a shallow birdbath with a raised area in the middle for smaller birds. This device works well but is wide enough that ithangs over the raised area and is basically heating the air there. Never the less it worked well --- I think you need to start using this inthe Fall to get birds used to it though---- we have not had much "action" -- with 23" of snow on the ground even birds get discouraged.We will use this starting in November and I'll bet we keep birds all winter.