Receiver Model 1099-50 w/coax antenna covers both (300/310 MHz and 12 and 24 volts AC) Works with Multicode 300 MHz remotes or Stanley 310 MHz remotes, but not both at the same time. Has jumper settings for frequency.
The 3028-50 is an auto sensing 12 or 24 volts AC or DC Multi-Code or Stanley compatible gate receiver. It eliminates any chance of damage to either the gate operator or itself from running off the wrong voltage.