Image Item No. Description  33718  Electric Hub, USB - WeDo Robotics Catalog: Parts: Electric  86444  Electric Power Adapter / Transformer, Input: 120V AC / Output: 10V DC Catalog: Parts: Electric  87662c01  Electric Rechargeable Battery 7.4V - NXT, DC plug Catalog: Parts: Electric  bb0398  Electric Sensor, Color - NXT Catalog: Parts: Electric  43718  Electric Sensor, Motion - WeDo Robotics Catalog: Parts: Electric  14618  Electric Sensor, Tilt - WeDo Robotics Catalog: Parts: Electric