... security systemSystem Features l Large LCD English blue back-light display, voice prompt, ease of use. l Support dual-network of ... and 150 sensors. l Unique black box features, you can display most recent 72 disarmed records and 102 recent alarm recording ... with either dual-band, triple-band, quad-band GSM/GPRS industrial graded module, stable and reliable. Home gsm security system with LCD display ...