... Point Reading Pen Description:Memory Capacity: 2 GB/4 GB Lithium Cell: 3.7V, 350mAh Speaker: 4 Omega, 0.8 W Size ... , can use AAA batteries, also equipped with a built-in lithium battery, realize the use function of power never.8. Multiple ... course, other books to learn customer to provide their own material. Need9. Our exclusive launch powerful CARDS, with this card, you ...