Hardware specification
Size	109 x 55 x 19 mm
Weight	116g
Processor	OMAP 310 (ARM9@130Mhz)
Hardware Accelerators	None
RAM	16MB
Internal storage	24MB (only 4 MB available for user storage)
External storage	MMC
Screen Type	Transflective TFT
Screen Resolution	176 x 220 pixels (only 176 x 208 accessible through Symbian APIs)
Screen Size
Pixel Size
Colors	65K
Max Framerate
Audio (usable through Mda API)
Keyboard	5-ways joystick
Camera Resolution	VGA
OS Specification
Symbian Release	6.1
GUI Platform	Series 60
Java Support	J2ME CLDC 1.0 / MIDP 1.0
Communications
GPRS	Class 10 (4Rx/2Tx) (up to 53.6kbps (Rx) or 26.8kbps (Tx) with CS-2 coding). Class B: no simultaneous voice and data
HSCSD
IrDA	Yes (SIR)
Bluetooth	Yes (1.1)
Bluetooth Profiles	COM Handsfree
USB	Yes (slave)
Misc
FM Radio	Range 87.5-108Mhz (Can be controlled through dedicated C++ API)
ON-target debugging	Not Supported

See also the SX1 FAQ on Siemens web site.