The ASL 554 Wireless Mouse Emulator is adjustable in a 3, 4, or 5 switch configuration. In the three switch configuration full mouse emulation is achieved with only three switch inputs. For instance the right direction can move the mouse cursor right and left across the screen. The left direction can move the mouse up and down the screen. The forward direction can control left click, double click and drag functions. In a four switch configuration the right direction will move the cursor in a right direction across the screen, the left direction will move the cursor left across the screen and the forward direction will move the cursor up and down. Left click, double click and drag is achieved with a dedicated switch. The five switch setting allows the power wheelchair joystick to become a joystick operated mouse operating in all directions. This setting also requires a dedicated switch for left click, double click and drag. The Zigby frequency allows this wireless mouse to work without the transmitter and receiver being in line of sight so the transmitter can be mounted anywhere on the chair. It can also be paired with multiple receivers and multiple devices. The transmitter can be powered up by a USB port, 2 AA batteries or straight from the power wheelchair batteries. The receiver will power directly from the devices USB port. Power Source Not Included.