Hi Super,
That is indeed a USB port in the third image and is the section of track that provides the power to the circuit. The two jack sockets either side are for the hand controllers (typical slot car controllers with a plunger on top and a 'full speed' button on the front. There is also a screw control on the bottom to limit the top speed if kiddies for example are using them to prevent too many spills. Although the cars do also have 'magnatraction' type magnets so they stick to the track pretty well. There is something like 18 pieces of track including the power section and a lap counter, I just used 6 to demonstrate it working. You also get a bunch of bricks to provide scenery (trees/flags etc...) as well as enough to build a building, start gantry etc... Of course you can also use any other Lego so it is ultimately expandable. You can also add another set, in fact there is a second set with different cars so I may well get that too in the longer term.
As for the headlights, they do work, but only tend to come on when you are running nearly flat out, I suspect this is because with USB as the power source you are limited to 5v and if they are in series on the mini circuit board there's probably not enough power until you are really pushing the little cars which I wasn't in the video. Regardless the set is a nice little novelty and something that could interest kiddies into the world of real slot cars if exposed to it. It currently sells on Amazon at £49,99 but there is also a 10% discount voucher claimable reducing it to £45. Not that much these days...
That is indeed a USB port in the third image and is the section of track that provides the power to the circuit. The two jack sockets either side are for the hand controllers (typical slot car controllers with a plunger on top and a 'full speed' button on the front. There is also a screw control on the bottom to limit the top speed if kiddies for example are using them to prevent too many spills. Although the cars do also have 'magnatraction' type magnets so they stick to the track pretty well. There is something like 18 pieces of track including the power section and a lap counter, I just used 6 to demonstrate it working. You also get a bunch of bricks to provide scenery (trees/flags etc...) as well as enough to build a building, start gantry etc... Of course you can also use any other Lego so it is ultimately expandable. You can also add another set, in fact there is a second set with different cars so I may well get that too in the longer term.
As for the headlights, they do work, but only tend to come on when you are running nearly flat out, I suspect this is because with USB as the power source you are limited to 5v and if they are in series on the mini circuit board there's probably not enough power until you are really pushing the little cars which I wasn't in the video. Regardless the set is a nice little novelty and something that could interest kiddies into the world of real slot cars if exposed to it. It currently sells on Amazon at £49,99 but there is also a 10% discount voucher claimable reducing it to £45. Not that much these days...
Happily collecting things all my life... 
![[-]](https://www.blueplastictracks.org/images/collapse.png)