. standard quality to provide accuracy and stability; Using microprocessor for circuit control and gas monitoring to assure performance stability

and reliability;

. Low battery warning;

. Compensation according to operating time and environmental conditions such as temperature;

. Timer function is included, can be pre-programmed in the factory to 3 years duration to alert customers to replace with a new unit

. Sounding a loud alarm signal of exceeding 85 dB at 10 feet at alarm mode;

. Test button to verify operation;