Graptopetalum Paraguayense x Sedum Pachyphyllum hybrid. It is also sometimes called Graptosedum 'Darley Sunshine'.
It's care is similar to that of all succulents, place in a bright spot. Gradually introduce to full sun to avoid sunburn on the leaves. Water regularly in the summer months, and less frequently in the winter. We recommend to bring the plant inside if nighttime temperatures fall below -6 degrees Celsius.