The Model CK-A11N OSL contains phase matched RF Short and Open components, in addition to a DC-6 GHz 2 Watt resistive rf load in a single convenient package, with Type N male connectors. A lanyard is also supplied with the unit, for hands-free convenience in tight spaces or ladder use. The unit is also available with female connectors and 4.3-10 or 7-16 DIN connectors