Features: 1.Stable Performance: Accurate and clear parameter display, low power consumption, anti vibration, anti shock. 2.High Grade Texture: The matte texture is used to better integrate with your car and show more taste. 3.Waterproof Design: Effectively prevent rainwater from entering and avoid damage to the voltmeter. 4.Simple Installation: No complicated procedures, easy installation in a few simple steps. 5.Wide Application: Having a wide charging range and can be used in all vehicles with an input voltage of 12V?24V. Specification: Item Type: Dual Display Temperature Voltmeter_x000D_ Material: ABS_x000D_ Colour: Black_x000D_ Input Voltage: 12-24V_x000D_ Output Voltage: 5V_x000D_ Output Current: 4.2A_x000D_ Applicable Charging Range: For All Input 12V Car Charger_x000D_ Hole Size: Approx. 27mm / 1.1in