GF-07 Improved magnetic location Preparation: a SIM phone card and minimum memory card. Can I use 3G / 4G SIM card GPS: one works with 2G GSM network and supports 3G / 4G input so you can choose 3G / 4G SIM card, but only use 2G signals Battery: 3.7 V 400 mAh Li-Ion Standby Time: 12 days Working time 4 to 6 day-hot Message: 1. You must buy GSM SIM card in the local area. Be 2. Each month will cost the data for the data flow fee, about 50 MB per month. 3. If you send command and do not receive an answer, please call the device, if it replies that the user is busy, which means OK. Then set the administrator number. If it goes directly to the voicemail, please turn off the voicemail. You can call it off to turn it off. Or you can turn it off in your phone settings The package is included: 1 x USB cable 1 x GPS tracker 1 x instruction manual (which follows) When you buy this product, please contact customer service for to ask for instructions.