Interactive Pen (Slim Marker Model) for use with IPEVO-01 Interactive Whiteboard System Interactive Pen for use with the IPEVO IS-01 Interactive Whiteboard System (not included-sold seperately) Powered by 2 AAA batteries (not included) for optimal battery life 5 3/4" length to mimic a normal whiteboard pen size Slim design fits nicely in even small hands (widest portion is 3/4") Please note: IS-01 (not included) does not support multi-touch functions. Only one Interactive Pen can be in use at a time