Product DescriptionRL-RF2 is the main unit that can dial telephone or cellphone automatically via GSM once triggered.Adopts GPRS wireless transmission technology. It can dial telephone or send SMS automatically for alarm without telephone line, wirelessly arm/disarm the system and monitor the voice from the site.Working distance is above 60m, the range for main unit is above 100m in open area.433 MHz wireless alarm signal transmission avoids wire installation trouble and expense.Dial telephone or cellphone automatically when receiving alarm signals.Alarm in emergency.GSM alarm system.Wireless monitoring function.Voice recording function.All settings and recorded messages will not be lost when power failure occurs.Up to 38 accessories (such as remote control and transmitter) can be used in the system.Compared with similar products, this system adds a wireless outdoor siren. When the alarm is activated, a loud siren with flashing light will attract the attention from your neighbors and frighten away the intruders. The main unit can be hidden or locked away for added security.Easy installation of this system makes it advantageous over other similar products.The system will call the saved 6 groups of phone number in arming mode when someone intrudes illegally.ALARM button is available for instant alarm in emergency.DIY installation.