The CPS Products Automotive Leak-Seeker leak detector, No. LDA1000H, features E_MOS sensor technology which incorporates a proprietary pulse modulation design to increase both battery and sensor life. Microprocessor-controlled sensor electronics utilize a multi-channel signal detection method to improve sensitivity while reducing false alarms. This unit features a software-managed sensor rejuvenation mode, initiated at each start up to ensure the highest level of sensitivity every use, for up to 500 hours of detecting leaks of less than 0.1 oz per year. Sensitivity remains constant over the life of the sensor. Including both visual and audible leak indicators, the LDA1000H has a 500-hour sensor life, 50-hour battery life, takes three C batteries, includes an "Auto Off' after 10 minutes and a green LED low-battery indicator. The LDA1000H is ETL-certified to meet SAEJ2791 for R-134a, as well meeting all US and International standards for automotive use for SAE J2913 for R-1234yf, and Euro Standard EN 14624.