A method for transferring a signal between a calculator device having a USB connector and a remote device is described. The method includes: connecting the calculator device with the remote device using the USB connector; transmitting a signal from the remote device to the calculator device using the USB connector; and receiving the transmitted signal from the remote device. A calculator device having a USB connector is described. The calculator device includes a processor for executing one or more instructions, a memory connected with the processor and storing data and instructions for execution by the processor, and a USB connector connected with the processor and connectable to a remote device for transferring a signal between the calculator device and the remote device. The calculator device is responsive to a signal received over the USB connector.