Hot dots makes ordinary flash cards into individualized basic skills tutors! Use like regular teacher-directed flash cards with individual students or small groups. Add the hot dots talking pen (ei-2770, sold separately) and students can drill independently with hot dots instant reinforcement! Students touch pen on correct answer and get a positive response. The plastic storage case included also makes these great send-home helpers for those students needing some extra reinforcement. All for about the same cost as regular flash cards. Approx. Weight: 9oz. Approx. Dimensions (inches): 5.5 X 4 x 2.5.