Memory: 32M(30.5MB is for operation system) Windows system: windows2000/XP/vista Resolution: 640*480 2M 40 inch H-V Ration: 4:3 Projection degree: 35 degree input: USB-VGA color: 6000K Contrast ratio: 100/1 Lumens: 12 lumens Power consumption: 5W Light source: High white light,LED Projection Mode: Front Screen Drive mode: Built in the driver for connecting to PC Screen display:Main screen, Sub screen Projection technology: LCOS Focus adjustment: manual Connect port: High speed USB2.0 Machine fix mode: Tripod fix mode Lamp life: 20000 hours Dimension: 93*65.5*21.5mm Weight: 90.3g Projection distance: 0.25M -3M Screen size of projection: 3.5inch -70inch Connection method: PC-USB2.0 Power supply: Two USB 5V 1A Power on /off: pull out the USB directly Operation temperature: 0-40 degree battery:none adaptor:none Voltage request: 5V/1A