Instruct: Classify the given review into positive or negative sentiment.
Query: Works, but only for keyboards and mice that ALREADY come with them.

I ordered this device hoping to connect one of my existing PS/2 keyboards to my USB-only laptop. I'm not a neophyte, but unless one knows exactly what "passive" indicates in this context it is impossible to infer the impotence of the product. Spending the four dollars isn't the worst - that's reserved for knowing I should've just driven to the corner superstore and bought a new USB keyboard instead of waiting for this to ship. FAILURE, Amazon.com.