sentence: technical specifications operating system android , officially 2.1 , can be upgraded to custom 2.2 roms power 4.2 v 1150 mah ( 4.3 wh ) internal rechargeable removable lithium-ion battery cpu 768 mhz arm 6-capable processor , underclock to 528 mhz storage capacity flash memory : 256mb with microsd slot supporting up to 16 gb memory 192 mb ddr sdram ( some models have 256 mb ) display 320 x 480 px , 3.5 in ( 89 mm ) , hvga , transflective tft input '' capacitive '' touchscreen display without multi-touch feature , on-screen qwerty keyboard , volume controls , 3-axis accelerometer , 4 front-facing physical buttons camera 3.2 megapixel cmos sensor with auto focus ( rear-facing camera ) .