standardfunction: one~ ten times ring choice unit defense xone detector celetes choice match with center alarm stating port power supply will be support 36hours six groups telephone number circu late alarm ten seconds records alarm reminder one million groups automatically recognize study code eighty seconds set defense and thirty-six seconds delay choice display 12 wireless and 4wired alarm areas long- distance control key board and locale monitor operation . technology parameter: 1. electric current : 20Ma 2. POWER VOLTAGE: AC220V± 10 3. usage environment : -10degreeto 50 degree 4. alarm current ; : 270mA( 12V) 5. size : 158mm* 111mm* 37mm 6. power supply : DC9~ 12v 15Ma