Can someone tell me if this is a jumper pak or a expansion pak?

I have a memory card for the nintendo 64 but i don't know if either it's a expansion pak or a jumper pak. on the memory card it says. N64 Expansion Ram and under that it says 4MB Expansion memory for N64. the company is Pelican Accessories i want to know because i want to be able to play games like Donkey Kong 64? And its a black color so that's why i'm confused? any help i can send a pic. of the memory card to anyone that's willing to help?