At first insert a 2G SIM Card in SIM8001 Module and wait a few minutes. When the SIM8001 searches the network, the LED will blink faster and when it connects to the sim network the LED blink will slow down. Now, when you try to enter an infected area, the GPS module will alert you and will send a message to the set number regarding your contact with the infected area. Congrats, now COVID-19 Fencing System and Contact Traceability Device is redy to protect you...