Power supply: AC 220V; AC230-240V; DC9V battery Working frequency: 315MHz/433MHz Alarm limit: Coal gas2000ppm(30% tolerance); Solid petroleum5000 ppm(30% tolerance); Natural gas2000ppm(30% tolerance) Working current: Normal 150mA; Alarm200mA Working ... - Update: 2009-10-10

Power supply: DC9V battery Working frequency: 315MHz/433MHz Working temperature: -5-55 degree Relative humidity: Less than 95% Static current: 6500 LUX Detecting angle: 360 degree Place of installation: 2.4m (above the ground), detector diameter 4.8m... - Update: 2009-10-10

1. 32 LED display of defense zone 2. Built-in rechargeable lithium battery; 3. Set alarm/siren hooting time for 0-99 seconds; 4. Time delay to arm/disarm for 0-99 seconds; 5. Time delay to alarm for 0-99 seconds. - Update: 2009-10-10

1) Compact design, Orange backlight, big LCD Screen Display. 2) Self-check function(optional); 3) Illegally arm/disarm function(optional); 4) Anti-tampering alarm; 5) Can dial via neighbor's phone when phone line is cut off; 6) Low power indication f... - Update: 2009-10-10

No need to connect to telephone/landline, uses GSM (SIM card). Can be set ON to receive mobile SMS/alerts. Composing messages, message to control the system. AC power failure and on message alert Mobile text message alert when alarm Features Long-dis... - Update: 2009-10-10

1. AC power failure alert function; 2. Built-in battery low voltage alert; 3. Telephone ringing times programmable (0--9 times); 4. Delay to arm time programmable (0-99s); 5. Delay to alarm programmable (0-99s); 6. Alarm siren hooting time programmab... - Update: 2009-10-10