GF07 Mini GPS Tracker Car GSM GPRS GPS Locator Platform

How to test product fastly? 1st step: insert sim card into device, the indicator will be flickering for 3 seconds 2nd step: phone call to device to check if the sim card is good or bad 3rd step: pull out sim card and insert sim card again, send sms "777" to device by mobile phone, you will receive a location reply in 1-2 mins 4th step: phone call for remote listening in how to charging battery? insert sim card, then use 5v 500ma power adapter to charge battery via usb cable equipped.