We have excellent customer service and professional tech support. If you have any questions, PLEASE DON'T HESITATE TO CONTACT US.?Whatsapp: +8615581010480? TKSTAR GPS tracker is perfect for vehicle fleet management, cars, truck or anything else you'd like to track. ?3 Month Extra-Long Standby?:5000mA ultra large capacity rechargeable battery, can standby for 90days Maximum after fully charged(Without using the device at all). Normal Working time:1-3 week.(Battery life depends on how often the device is used. The higher the frequency, the shorter the battery time. The lower the frequency, the longer the battery time) If it shows "Not enabled" on the APP, we need to set APN first. Firstly, Need to ask the carrier about the APN informtaion of the SIM card in tracker .( APN name, APN username and APN password) Then send those command: 1. gprs123456 2. apn123456 "APN name" 3. apnuser123456 "APN username" (no need to set if without apnuser) 4. apnpasswd123456 "password" (no need to set if without password) Have a space after 123456 , don’t need to send last two commands if sim card don’t have username and password For example For Speedtalk APN name:mobilenet APN username:(none) APN password(none) Then send 2 commands: 1.gprs123456 2. apn123456 mobilenet If u do not know how to set APN, you can email us via , we can set apn for you, it's the easiest way. Specifications: Network: GSM/GPRS(2G) GPS accuracy: 16-32 ft LBS accuracy: 328-3280ft Working Time: 3 Weeks Standby Time: about 90 days Size: 90 x 72 x 22mm(3.54"-2.83"-0.87") Package: 1*gps tracker(SIM not include) 1*instructionFree APP and Platform for Unlimited Tracking?: We provide a 12-month warranty and lifetime technical support for our GPS trackers, please feel free to contact us whenever you need help. We will respond within 12 hours!. Strong Magnetic & Easy to Install ?: Built-in 5pcs strong magnets, gps locator can easily attach the device to any iron surface, easy to install and hidden. IP65 waterproof, no need to worry on rainy days. Anti Theft Functions?: Shake alarm | Geofencing | Overspeed alert | Historical playback. Whether it's commercial fleet management or tracking the safety issues of the people you care about when they drive, our tkstar tracker is a perfect choice. Precise Positioning?: GPS+LBS dual mode positioning provides you peace of mind. If the GPS signal is good, the vehicle tracker will be positioned through the GPS satellite(the accuracy is 16ft-32ft/5-10m); otherwise, vehicle tracker will be positioned through the LBS(the accuracy is 320-3200ft)!. SIM Card Not Included?: Just like a mobile phone, our car tracker requires a SIM card to work. Works with 4G & 2G network, please buy a 4G/2G SIM card and insert it into our tracker device. Then you can real-time track through SMS, APP and website on mobile phone, tablet or PC. If worked with SpeedTalk SIM whose monthly fee is $5 in the US.