DC12V is the operating voltage for A23 or A27 batteries. Frequency option (315MHz, 433.92MHz, 868MHz, etc.) Operation current 7-9 mA Mode of Modulation ASK 100 meters away (in an open space) Size of unit: 59x32x13 mm IC EV1527, PT-2262, HT-12E, HCS300/301, etc., should be encoded.