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Please note that! We provide versions for different frequency bands. To ensure the best user experience, please choose the appropriate version based on your own situation, as there may be compatibility issues between them. parameter configuration： 4G frequency band - CAT1 LTE-FDD: B1/B3/B5/B8, LTE-TDD: B34/B38/B39/B40/B41 Data LTE: Maximum 10 Mbps (DL)/Maximum 5 Mbps (UL) EDGE: Maximum 236.8 kbps (DL)/Maximum 236.8 kbps (UL) GPRS: Maximum 85.6 kbps (DL)/Maximum 85.6 kbps (UL) GNSS chip GPS, GLONASS, BeiDou/Compass, Galileo, QZSS Working environment temperature -20 ℃ -+70 ℃ Working environment humidity of 20% -80% RH SIM card Nano SIM card holder Battery 3.7V 500mAh The average standby current is less than 5mA (determined by the connection method) I/O interface Micro 5pin Speaker 0916 specification AAC 3D G-Sensor sensor GPS positioning accuracy within 10 meters WIFI positioning accuracy within 50 meters Network positioning accuracy of 50-200 meters (depending on network conditions) Speed accuracy of 0.1 meters per second The GPS positioning time for cold start -38s (Open sky) and hot start -2s (Open sky) may vary depending on the environment Shell material PC material injection molding, spraying 4G antenna PIFA antenna The standby time is determined by the battery capacity and connection method Working voltage 3.5-4.2V (3.4V low power automatic shutdown) Charging current: 5V 500mAh (current can be set according to different battery capacities) GPS antenna external passive high-performance 15X15 ceramic antenna Service Time Beijing Time: From 9:00 am to 18:00 pm. London Time: From 2:00 am to 11:00 pm. Moscow Time: From 4:00 pm to 13:00 pm. Pacific Daylight Time: From 18:00 pm to 3:00 am About shipment : 2. Usually your order will be sent by the shipping way you choosed, if that shipping way not available to your address, seller will contact you to change other way. About return & refund : 1.we accept return and refund, if its product quality issue, seller will pay the return shipping cost. if its other reasons, need buyer pay the return shipping cost. 2. Customized product not accept return & refund except quality problem. Feedback: 1.if you are satisfied with the items and our service, please take a minute to leave us a positive with 5 stars. 2.please do not hesitate to