The Sony Xperia X10 mini pro (not to be confused with Sony Xperia mini (pro) without the "X10" in its name) was released in February 2010.
Sony Xperia X10 mini pro (source: GSMArena)
- CPU: 600 MHz ARM 11
- GPU: Adreno 200
- RAM: 256 MB
- internal storage: 128 MB
- removable: microSD up to 16 GB
- display: 2.55" 240 x 320 px TFT
- rear camera: 5 MPx
Full specifications can be found at GSMArena.