1、This tracking device sets all functions of security, tracking, monitoring, emergency alarm and management. 2、This product has two powerful magnets built in, no need to worry about the problem of placement, as long as there is metal place can be directly put. 3、When the battery of the product is shut down, the power supply will be connected to automatically start up and continue charging. The SIM card must be inserted when charging. 4、It can be put in the car, in a child\u0027s bag, in an old man\u0027s pocket, etc. 5、The error distance of the product is very small. Positioning/remote listening/voice-activated callback. 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 power supply will be connected to automatically start-up and continue charging. The SIM card must be inserted when charging. 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 Device Material: Plastic Color: Black Network type: GSM/GPRS Frequency of communication: 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 cards: Mini TF card Continuous calls: 150-180min Humidity range: 5%-95%non-condensing GPRS: Upload60,TCP/IP Item weight: 20g Item size: 42*24*16mm Package weight: 34g Package size: 8*6*6cm Package list: 1 * Tracking Device 1 * USB cable 1 * User manual 1 * Tracking Device 1 * USB cable 1 * User manual