GF - 07 enhanced magnetic locator Preparation: a SIM phone card and mini memory card. "Can I use the 3G / 4G sim card?" the gps works with the 2G GSM network and supports 3G / 4G input so you can choose the 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 days Warm Notice: 1.You need to purchase GSM SIM Card in the local area. 2.Every month will cost the dataflow fee network, about 50 MB per month. 3.If you send command and get no replyplease call the device,if it answers you user busy,which means ok.then set admin number.if it goes straight to the voicemail,please turn off the voicemail.you could call the customer service to turn it off. or you can turn it off in your phone settings Package included: 1 x USB cable 1 x GPS tracker 1 x Instruction manualas follow