Can be plugged directly into one of the 2 connectors ("Reader 1" or "Reader 2") of the A22 26-bit Wiegand output External antenna SEA433 included Receiver type: Superheterodyne Used frequency : 433.92 MHz dimensions : 105 x 45 x 28 mm power supply : 12V DC MHz consumption : 24 mA input impedance : 50 Ohm