Panasonic KX-A406 - Wireless Repeater for KX-TGP600 KX-A406 Wireless Repeater works with the KX-TGP600 system to expand the indoor communication area from the standard 164 feet (50m) to approximately 656 feet (200m), depending on the environment. Panasonic's expandable KX-TGP600 SIP cordle..