The 9 Volt DC 300ma Wall Pack Power Supply is recommended for the Board of Education (#28150) and the BOE Full Kit (#28103). It is also used in all Stamps in Class guides (except Robotics). Please note that Parallax BASIC Stamp® Starter Kits DO NOT include a power supply. Each BASIC Stamp Starter kit page includes a link to the recommended power supply below the product description in the "Related Products" section. Please email support@parallax.com if you have any questions regarding the proper power supply for your project.
Resources: Power Supply Recommendation Chart