Features: Multi-functional security device with tracking, monitoring, alarms, and management capabilities. Specifications: - Type: Magnetic GPS tracker - Material: Plastic - Color: Black - Talk time: 150�C180 min - Standby: 12 days - Working time: 4�C6 days - Expansion: Mini TF card - Network: GSM/GPRS (850/900/1800/1900MHz) - GPS locating time: 25 sec - Power input: AC 110�C220V 50/60Hz - Power output: DC5V 300�C500mA - Battery: 3.7V 400mAh Li-ion (included) - Working voltage: 3.4�C4.2V DC - Storage temp.: -40��C to 85��C - Operating temp.: -20��C to 55��C - Humidity: 5%�C95% (non-condensing) - Size: 4.2��2.5��1.6cm / 1.7��1��0.6in - Weight: 100g / 3.5oz Package includes: 1 �� GPS tracker (battery included) 1 �� User manual 1 �� USB cable Usage: - Record: Send "555" to device - Sound monitoring: Send "666" - GPS tracking: Send "777" (receives location + map link) - Positioning history: Send "102" - Delete memory: Send "445" - Reboot: Send "999" (starts after 1 min) - Reset: Send "444" - Factory reset: Send "*#*#*#"