Velleman 8 channel relay card kit and control set velleman k8056 the velleman 8 channel relay card kit can be used in several ways as a stand alone card addressed by switches or open collector outputs this unit is compatible with the 8 channel relay board k8056 order code 70 4182 the 8 channel remote control k8058 order code 70 4181 and the rx433 rf order code 70 4185 receiver module the velleman 8 channel relay card is also available as a pre assembled module velleman k8056 8 c