Before you can start driving, you have to unroll the mat and charge the cars. It takes about eight minutes to fully charge the vehicles inside their cases, which can be powered simultaneously thanks to the multi-headed USB cable, and they can then go for 20 minutes before having to be juiced up again. It’s somewhat surprising that the cable only has three heads, rather than four, the maximum number of cars that can be used at a time. While they’re…
