This LEGO Mindstorms 2.0 RCX 257135 set is a great addition to any LEGO collection. It comes complete with all the necessary pieces and instructions to create a variety of fun and functional robots. The set is recommended for ages 8 and up and includes the LEGO theme of Mindstorms, set number 3804, and model 884c. The set is retired and was manufactured in Denmark in 1998. It is suitable for both boys and girls and includes the LEGO subtheme of 2.0. The set is part of the LEGO product line of Mindstorms and is perfect for those interested in robotics and building toys.