No installation needed: GPS Tracker Easy attachment to any iron surface with a strong magnet, even in the car just a second. Precise positioning: GSM / GPS dual positioning mode, positioning accuracy up to 5 meters. Specification: Size: 90 x 72 x 22mm; Weight: 168g; Battery: 3.7V 5000mAh Lithium rechargeable battery; Standby time: 90 days (Low power state) .You need to insert a SIM card that can use the GSM network.If you have any problem, please contact us. Features: GPS Tracker Speeding Alert; Geo-Fence (Set an area, when the car enters and leaves the area, it will send alert message to your mobile phone); real-time tracking; Function vibration alarm (After the car stops for five minutes, If the car restarts, the tracker will send SMS alert to your mobile phone). Wide use: GPS Tracker Track the location of lost vehicles (rental car, truck, motorcycle, freezer, boat, etc.)* This device just can work with 2G GSM network, and this item will not include the Sim Card, please purchase it from your local.* Please make sure GSM SIM card support call, send message, GPRS network.* Please make sure the GSM SIM card has sufficient balance.* Please make sure the GSM card has opened the call id display function and turned off call forwarding.* Make sure the PIN code has been canceled. (you can insert it into the mobile phone to cancel the PIN code. before inserting it into the tracker).* Please insert the GSM SIM card correctly into the device. The SIM card chip is facing up.* Please use normal SIM card for tracker, not Micro SIM or Nano SIM.