Here is a robot kit that your kids can easily put together and program from their smartphone. The Ubtech Jimu Robot Meebot comes with interchangeable parts that snap together. The companion app provides them with 3D building instructions. The kit comes with 6 robotic servo motors . You can program your own actions.
Jimu Robot is recommended for kids age 8 or older. You have 201 snap-together pieces to bring your own characters to life. You can buy it on Apple.com.