our main products are gsm alarm,mms gsm alarm, IP camera,wireless alarm,power alarm,anti-losing alarm,door/window sensor,etc Product DescriptionFeatures: 1) Power source: DC 9V, AC 220V, DC 9V and AC 220V 2) Working current: : Surveillant current<15?alarm current: <30mA 3) Alarm sound: >85dB 4) Ambient temperature: -10 ~ 50 centigrade 5) Low battery alert: 7 days 6) Can be used separately as well ...