ebayで買った中華マウスのホイールが初期不良だったので英語で頑張って書いた。 Thank you for your reply. 1. The packaging was perfect condition, no holes or dents. 2. I used the mouse you sent in replace to the same model of the mouse. I carefully replaced the mice not to confuse the use-receiver module and the mice. The batteries I applied were brand-new and proper type. I tried on different PC, but the problem could not resolved. 3. the scrolling is reversed fore and fro when I touch the wheel. it is of no use. Best regards!