Technical Parameter: GSM frequency: 900/1800MHz (standard), 850/1900MHz (optional) Working frequency of detectors: 315M & 433M (optional) Alarm mode: GSM SMS and voice dialing Alarm response time: Less than 8s (GSM in normality) The volume of siren: More than 110db Power requirements: AC 110-220V 50Hz or 60Hz Working power consumption: less than 3W Standby battery: DC 8.4V, 800MAH (Lithium battery) Standby battery working time: more than 15 hours Operating temperature: -10 ~ 55 Humidity: 20% to 95% (non-condensing) Dimension: 160(L)*113(W)*38(H)mm. Dimension: 160(L)*113(W)*38(H)mm Weight: 2.5kg/set.