GEX Harmony Sheet Heater S Used for about 3 weeks starting November 22nd to keep a baby Java sparrow warm. It has become unnecessary as the bird has grown up safely. Since it was used under the case, it did not come into direct contact with the bird. Temperature cannot be adjusted. It provides gentle warmth. Please consider carefully as we do not accept returns or exchanges. I will ignore the standard Mercari comments and requests for price reductions. Instant purchase is OK without comments! I will give priority to the person who purchases first, even if there are comments in progress.