For questions truly specific to the "HTC HD2" (aka "HTC Leo").
The HTC HD2 is a Windows phone manufactured by HTC and also marketed as the HTC Leo. It is also known as the HTC T8585 and HTC T9193. Originally a Windows phone, it also can run Android.
HTC HD2 (source: GSMArena)
- CPU: 1 GHz Qualcomm Snapdragon
- GPU: AMD z430
- RAM: 576 MB
- internal storage: 512 MB / 1 GB
- removable: microSDHC up to 32 GB
- display: 4.3" 480x800 px TFT LCD
- rear camera: 5 MPx
Full device specifications are available at GSMArena.