This toy monster truck lets boys and girls aged 7 and over perform spectacular Monster Jam stunts. The LEGO Technic Monster Jam DIGatron (42199) has a cool pull-back function that lets the model car speed off so kids can recreate the breathtaking stunts of their favourite monster ...This toy monster truck lets boys and girls aged 7 and over perform spectacular Monster Jam stunts. The LEGO Technic Monster Jam DIGatron (42199) has a cool pull-back function that lets the model car speed off so kids can recreate the breathtaking stunts of their favourite monster trucks.