Features: This tracking device combines all the functions of security, tracking, monitoring, emergency alarm and management. The product has two powerful built-in magnets, so you don't have to worry about the placement problem. As long as there is a metal place, it can be placed directly. When the battery in the product is discharged, the power supply will be connected to automatically start and continue charging. The SIM card must be inserted during charging. It can be placed in the car, in a child's bag, in an elderly person's pocket, etc. The error distance of the product is very small. Positioning/remote listening/voice-activated redial. Specifications: Product Name: Tracking Device Material: Plastic Color: Black Network Type: GSM/GPRS Communication Frequency: 850/900/1800/1900Mhz Charging Input: Input AC110-220V 50/60Hz Working Voltage: 3.4-4.2V DC Charging Output: Output DC5.0V 500mA Storage Temperature: -40 to +85 Operating Temperature: -20 to +55 Expansion Card: Mini TF Card Continuous Calls: 150-180min Humidity range: 5-95 non-condensing GPRS: Upload60, TCP/IP Product weight: 20g Product size: 42*24*16mm Package weight: 34g Package size: 8*6*6cm Package list: 1 * Tracking device 1 * USB cable 1 * User manual