Wal-Mart customers will be able to use a handheld device to summon an empty cart and have it whisked their way via "motorized transport unit," according to Wal-Mart's patent, granted last week. The customer's location is determined by optical sensors in the device which will receive information from smart LEDs in the store, NBC News reported.
The system's "central control circuit" will also track shopping cart idle times to see which ones are not being used and implement image sensors to make sure they're empty.
And the carts will even be able to return themselves.