The MCS109950 and the MCS302850 are two auto sensing Multi-Code or Stanley compatible format gate receivers. They eliminate any chance of damage to either the gate operator or themselves from running off the wrong voltage. Nearly all gate orperators offer either 24 or 12 volts AC or DC as accessory power. Because these two receivers are auto sensing, each recognizes the gate operator's correct voltage. As a result, installers can be assured of always having the correct model gate receiver on the truck.