1. Features: 1), three management, safety and convenience; 2), lock off the LED lights flashing prompt; 3), low voltage alarm function; 4), operating an illegal card alarm function; 5), emergency external power supply function; 6), longevity structural design, efficiency and low consumption; 7) choose to use M1 card or EM card; 2. 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 Operating temperature: -20 ℃ - + 55 ℃ 5), product storage temperature: -30 ℃ - + 70 ℃ 6 ), the product Humidity: 20% - 95% RH; 7), the product warning voltage: 3.3 ± 0.2V; 8), products for door thickness: greater than 16mm.