In transmitting devices such as garage door operators, the values of V1 and V2 depend on the type and quality of equipment used to receive {HEAD ~ signals} from {TAIL ~ the transmitting device} and open the garage door 
from
In transmitting devices such as garage door operators , the values of V1 and V2 depend on the type and quality of equipment used to receive { HEAD ~ signals } from { TAIL ~ the transmitting device } and open the garage door
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH