Universal 433 MHz 4 Channel Mini Long-Range receiver Learn button for easy programming Coaxial antenna not included (SAE433) Accepts 85 transmitter keys (42 two button remotes) Keeloq Rolling Code for ultimate security 12-24 Volt AC/DC input voltage 2 NO relay + 2 NO/NC relay (24VA) Approximate distance of 1500 feet (clear line of sight) This receiver works where others won't !!!!