Roominate rPower Controller - A STEM Building Toy for Girls. RoominateTM rPower is a physical controller that brings girls' creations to life using the Roominate app from their phone or tablet! The small power hub can connect with up to 8 circuits simultaneously so girls can control multiple lights, motors, buzzers, and sensors on their Roominate creations. rPower is compatible with all Roominate kits and can be incorporated into any Roominate design. With rPower, girls can change how fast or slow a merry-go-round spins, move an elevator up or down, drive a car, turn lights on and off in a house, program lights to blink on a giant Ferris wheel, and so much more! Roominate teaches important STEM skills: hands-on problem solving, spatial and fine motor skills, self-confidence, and creativity. rPower is compatible with all other Roominate products and encourages open-ended play for endless possibilities. Set comes with rPower and 2 cable adapters for compatibility with all Roominate kits. Requires 2 AAA batteries, not included. Materials: ABS, electronics Dimensions: 5"L x 5"W x 2"H