1. Features: 1), three management, safety and convenience; 2), password plus induction, various combinations of control; 3), backlit keypad, clear-weather operation; 4), lock off the LED light flashes tips ; 5), low voltage alarm function; 6), the error code and operating illegal card alarm function; 7), emergency external power supply function; 8), structural design and longevity, efficiency and low consumption; 9) choose to use M1 card or EM card ; 2, the product parameters 1), three alkaline "AA" battery-powered (external emergency power for 6V); 2), quiescent current: less than 30uA; 3), the maximum operating current: less than 300mA; 4), the product Working temperature: -20 ℃ - + 55 ℃ 5), product storage temperature: -30 ℃ - + 70 ℃ 6), product Humidity: 20% - 95% RH; 7), the product warning voltage: 3.3 ± 0.2V; 8), products for door thickness: greater than 16mm.