CJ-9913A wireless door sensor, mainly used for a variety of anti-theft alarm system, generally installed in the door or window, when the door or window is opened, the wireless door sensor immediately signal the wireless launch to the anti-theft system, this The signal contains the address and status, allowing the system to identify the alarm location and location. Scope of application: Home security and so on Technical indicators: Operating Voltage 7 ~ 12V Quiescent Current ≤5uA (DC9V) Working current ≤6mA (DC9V) Working frequency 315MHz, 433.92MHz, special frequency can be customized Frequency error F0 ± 0.15MHz Frequency stability F0 ± 150ppm Low power indication operating voltage ≤ 8V Out-of-band attenuation ≥30dB