It is widely used for household monitoring; children, the elder, and pets care and the trace for lost cars or other possessions.
Usage Time - 240 Minutes
Power on: open the back cover, put the SIM card into the seats, then it is automatically power on. When booting, indicator will light for 10 seconds, after the indicator is off, cover the back cover then it can be used.
Send 0000 SMS to turn off sound control function. 5 - Send 1111 SMS to turn on sound control function.