The book introduces readers to 60 simple and complex electronic devices that can be easily assembled from the Master Kit sets. The kits contain all the necessary radio parts and boards for assembling electronic devices. They are sold in radio stores in almost all cities of Russia. The description of electronic devices is presented in four chapters, grouped by purpose of devices - from toys to complex measuring equipment. The book contains a catalog containing more than 300 items of electronic devices that can be purchased in the form of ready-to-assemble kits "Master Kit". This book is of interest to schoolchildren and students who are beginning radio amateurs, for service and repair workers, as well as for physics teachers and parents teaching children the basics of radio electronics and digital technology.