... 900/1800MHz or 850/1900MHz LCD screen GSM Alarm,wireless alarm,home alarm,GSM home alarm,wireless alarm,home alarm system,mms home alarm ... such as police station. 08.Fixed code for wireless accessories. 09. Send SMS to 3 preset mobile phone numbers and Auto-dial 3 ... temperature: -20°C ~ 60°CHumidity: 20% to 95% Wireless GSM home alarm system with 24 wireless zones LCD screen and color background light