... Dangerous 3.Public security--shop mall ect. Security phone for house! Main functons:Main Functions:1, support ... 1800 MHz2, Seed dial and redial function.3, Phone book function.4, Hand free function.5, Adjusting ... can be setting into by SMS. Phone . SMS and then phone.9, Displaying date, time, signal strength ... Alarm system, Alram telephone system,Security system. wireless alarm system,GSM wireless phone