... language can be added into the books and the pen.Full set of the product: one book, one pen, a USB line, ... read out indicator light(blue), (5) optical camera, (6) VOL+ (7) VOL- (8) recording button (9) earphone jack (10) charger and ... rechargeable batterychargerDC5V 300mAUSB jackHigh speed USB2.0outside size126×30×20mmweight38gloudspeaker8Ω,0.5WThe service we offerd:1.Pen design, mold development; ...