4G NETWORK SUPPORT: GPS tracker for vehicles with 4G network makes positioning more accurate, allowing you to avoid constantly worrying about car safety issues. GPS tracker for car ST-909L gps tracker include 2G and 4G network(SIM card Not include,you need to buy one). Car gps tracker 909L when the 4G network signal is poor, it can automatically switch to a 2G network. In the case where the network cannot locate, you can also send instructions 6690000 to obtain SMS location information With SOS Button: SinoTrack Car tracker ST-909L with SOS button,When the device under the abnormal condition,press the SOS button will send SOS message to the guardian and platform, calling the guardian at the same time. If you make call the SIM number in the device,it will pick up your call automactically and you will hear voice around the device Real Time Tracking: Real-time car GPS tracker ST-909L 4g gps tracker for vehicles hidden Locator based on LTE, GSM , GPRS network and GPS satellites ,locating and monitoring remote targets with our own GPS tracking APP or web, which display of location information accurately ( Positioning accuracy up to 10 meters ) SIM Card Not Include: SinoTrack gps tracker for vehicles with online tracking service. Buy a SIM card for the device (this GPS locator not include a SIM card, you need to buy another one), search sinotrackpro login or download Sinotrack Pro GPS APP from your tablet, pc or phone lifetime Plug and Play Car Charging Locator: Charger gps tracker looks like a charger, but in fact it can be used as both a charger and a locator. After closing the accompanying cover, the SIM card will be hidden. After a car is stolen, the locator is difficult to detect and can better ensure the safety of the car This is a multifunctional locator. This device can be used as a charger or as a locator. And it comes with two device covers. After covering the covers, the SIM card will be obscured, making it difficult to detect that this product is a locator. Its concealment is very good. The device also comes with SOS voice function. When you press the SOS button or send SMS command 66 to the device, the device will automatically dial the main control number you set, and you can hear the sounds around the device