Studio 1537 - upgrade RAM

Hello, I've not been able to find a board for the Studio 1537 so I hope this is okay. This is an old laptop but I would like to upgrade the RAM.

The processor is a Pentium(R) Dual-Core CPU T4200 @ 2.00GHz

It currently only has 1GB of SODIMM DDR2 Synchronous 800 MHz (1.2 ns)

I think the maximum it can take is 2 x 2GB 800 MHz DDR2 SODIMM but I was wondering if this is correct and whether it can take more?

Many thanks for your help!