Very schader

Shortly before Christmas, the first VaporizR ordered! My son 4 overjoyed. Exactly what he had wished. After a short time the VaporizR no longer just moves out because the wheels rotate at different speeds and when reversing "stutter" the VaporizR. New VaporizR ordered, son happy again. Unfortunately, only for 2 days. The range of the radio system has been reduced to about 5 feet. Again new VaporizR ordered. Unwrapped, played 10 minutes and vehicle unresponsive. Sent back and no new orders and my son is unhappy.
The concept of VaporizR is great, unfortunately the quality is not.