Kids can learn all on their own with the Hot Dots Light-Up Interactive Pen. Simply press the pen to any answer dot on one of dozens of Hot Dots and Hot Dots Jr activities for instantaneous audio and visual feedback. Lights and sounds indicate right and wrong answers, enabling kids to learn and practice critical learning skills independently, at their own pace, at home, in the classroom, or on the go. Each pen requires 2 AAA batteries, not included. Sold as 1 pen.