When Square Stand (1st generation) is not plugged into a power outlet, it utilizes the iPad’s battery as a power source.
First generation (left), second generation (right)
In this mode, the Square Stand (1st generation) will allow you to connect to Square Reader via Bluetooth to accept contactless and chip and PIN payments. Note: USB accessories are not supported in this mode.
Square Stand (2nd generation) must be plugged into a power source at all times to take payment.