The small flasher LEDs are shipped with an adhesive backing and 1/8" mini plugs for connection to all IR-controlled A/V components. Up to four flasher units may be connected to a single M-1A repeater using two M-1CB4B connector blocks or any standard adapter (by others). (Note: some high-end A/V components are equipped to accept hard-wired IR signals. In this case, F-1 flashers would not be necessary.)