The Xtrem Bots Sophie Bot Remote & Programmable Robot (Green) is powered by USB, no batteries are required. Sophie offers up to 50 programmable movements with sounds and moods. Program and control the robot using the remote or gestures. Learning through play is the foundation of the STEM philosophy, and this fun robot couple takes that concept to the next level. Program their movements, emotions, and dances, or control their movements manually or via your remote control. Create obstacle courses using everyday objects and challenge yourself by programming Sophie to overcome them. Develop STEM thinking and stimulate problem-solving in creative and fun ways.