Compatible with Allstar, Pulsar, gto 318 Frequency systems Switchable relay from pulse to continuous Codes using 9 dip switches with 3 positions each. (+/0/-) Switchable between 12 and 24 Volt The Heddolf P294-K by Keystone is a compact single channel 9 trinary (+, 0, -) code switch 12 or 24 volt AC or DC 5-wire type gate or garage door opener radio receiver with a wire antenna as well as an F-connector for adding a remote antenna that is directly compatible with the Allstar, Allister, Pulsar, GTO and Mighty Mule brand of radio controls that operate on 318MHz frequency. This Heddolf P294-K radio receiver has an isolated form "C" N/O, N/C relay contact closure that is selectable for either a 0.5 second pulse or maintained with remote control signal output that is selected by an internal slide switch. The Heddolf P294-K radio receiver includes a standard wire type antenna and also has a standard "F" connector for use with a remote antenna (sold separately) allowing the antenna to be remotely located for maximum range. This is the same radio receiver as the GTO, Mighty Mule RB709 radio receiver.