... signals, voice prompt, ease of use. Can install GSM phone card.2. Allow up to 6 wireless defense zones and ... Maximum length of voice message is 10 seconds.8. Telephone (phone) long-distance telephone control for arming, disarming, monitoring, remote ... with newest either dual-band, triple-band, quad-band GSM/GPRS industrial graded module, adapt to different countries, stable and reliable. Technical ...