Features:This tracking device sets all functions of security, tracking, monitoring, emergency alarm, and management.This product has two powerful magnets built-in, no need to worry about the problem of placement, as long as there is a metal place that can be directly put. When the battery of the product is shut down, the supply will be connected to automatically start-up and continue . The SIM card must be inserted when .It can be put in the car, in a child's bag, in an old man's pocket, etc.The error distance of the product is very small.Positioning/remote listening/voice-activated callback.Specifications:Item name: Tracking DeviceMaterial: PlasticColor: BlackNetwork type: GSM/GPRS Frequency of communication: 850/900/1800/1900Mhz input: Input AC110-220V 50/60HzWorking voltage: 3.4-4.2V output: Output DC5.0V 500mAStorage temperature: -40?C to +85?C Operating temperature: -20?C to +55?CExpansion cards: Mini TF cardContinuous calls: 150-180minHumidity range: 5%-95%non-condensing GPRS: Upload60,TCP/IPItem weight: 20gItem size: 42*24*16mmPackage weight: 34gPackage size: 8*6*6cmPackage list:1 * Tracking Device1 * USB cable1 * User manual