Is this mouse USB/PS2 compatible?

Yes, it's a USB mouse but also came with a USB to PS2 adapter.

Is this product (not) made in china?

Hello, Thank you for contacting us in regards to your question. This particular product is being offered through a Newegg Marketplace Seller. For more information, please contact them directly through their Seller Profile page. https://www.newegg.com/TripleNetPricing/about Thank you, Newegg Support