Charge your phone while monitoring your car's battery voltage and interior temperature. USB charger, voltmeter, and thermometer in one unit. Digital LCD display with real-time display of temperature and voltage. Suitable for both 12V and 24V systems – easy connection in the cigarette lighter socket. Get full control over your car's internal conditions with this smart 3-in-1 USB car charger. The device easily connects to the car's cigarette lighter socket and provides immediate information about battery voltage and interior temperature via a clear digital LCD display. The USB port on the top makes it easy to charge your phone or other USB-powered device with an output of 5V/2.1A. The display switches between different color combinations such as blue, green, and red depending on the measurement data, making it easy to read even in the dark. Perfect for those who want to monitor battery status to avoid starting problems and at the same time keep an eye on the temperature in the cabin or in the trunk. The thermometer measures from -9 to +80 °C and works with both 12V and 24V systems. Easy installation without tools – plug and play. Just insert the adapter into the car's cigarette lighter socket and start using it immediately – no extra settings needed. Specification - Model: VST-706 - Functions: USB charger, voltmeter, thermometer - USB output: 5V / 2.1A - Operating voltage: 12V / 24V - Temperature range: -9 °C to +80 °C - Display: Digital LCD - Color indicators: Blue & red, green & red, red - Material: ABS + electronic components - Size: 76 × 47 mm - Connection: Cigarette lighter socket