Detailed Product Description General Description:This is a Two -in - one device,It compatible PC Keypad and ... to choose the mode for operation . a.Connecting this device by USB cable to PC, it would show ''PC ... now in the mode of calculator (CAL).6,This device will automatic turn off during 6 minutes of ... Size: 16*9.5*3.0cmcalculator Compatibility This device compatible WINDOWS ME,2000,XP,VISTA and MAC ...