The ASL 503 Wireless Switch Transmitter and Receiver is an ideal addition for a client with a communication device or computer that is accessed by scanning. You can plug in up to 6 single switches that will wirelessly send a signal to the paired receiver. The signal will work from 30 feet away and does not need to be in line of site, so you can mount it anywhere on the chair or tuck it into a bag. They can be powered up from an external battery or a USB port. The wireless activation is immediate so there is no waiting for signals to travel and no wires to get tangled up in.