Equipped with voltage, current, and temperature measurement checker functions, this device allows you to monitor the voltage and current status of your car, protecting your battery, iPhone, and various Android smartphones. It also displays the temperature. (Voltage, current, and temperature are displayed in sequence. The current will naturally show 0 amps if no devices, such as smartphones, are connected for charging.) ① Features two USB ports, allowing simultaneous charging of iPhones, iPads, and various Android smartphones. Operation confirmed with iPhone 12. ② Provides overload, overheating, and short-circuit protection with a built-in resettable fuse, eliminating the need for fuse replacement, ensuring safe use. ③ Input voltage: DC12V/24V; Output voltage/output current (maximum): 5V/3.1A, with a maximum of 2.1A per port and 1A per port. ④ Includes an in-car temperature measurement checker function. Displays voltage, current, and temperature in sequence. Allows you to charge your smartphone in your car during power outages caused by disasters. Specifications: Display color: Blue Size: 78*40*30mm Input voltage: DC12V/24V Output voltage/output current (maximum): 5V/3.1A, with a maximum of 2.1A per port and 1A per port.