The Sync Stop
You may easily spot this object as a useless USB device because of its unusual shape. It’s called a sync stop and serves as a charging barrier. Simply put, it lets you connect gadgets to any USB port without fear of data transfer against your wishes.
It prevents data from flowing across the barrier by only allowing power pins to do so, ensuring that a gadget can still be charged via USB even if there is no data transfer. It’s a really useful thing!