Kewig Z8-A

KEWIG Car Charger User Manual

Model: Z8-A

1. Introduction

Thank you for choosing the KEWIG Car Charger, Model Z8-A. This device is designed to provide efficient and safe charging for your electronic devices while on the go. Featuring dual USB Quick Charge 3.0 ports, a colorful voltmeter, and an integrated ON/OFF switch, it offers convenience and protection for your vehicle's battery and connected devices. Please read this manual thoroughly before use to ensure optimal performance and safety.

KEWIG Car Charger with dual USB ports and voltmeter display

Image 1.1: The KEWIG Car Charger, Model Z8-A, showcasing its dual USB ports, ON/OFF button, and integrated colorful voltmeter display.

2. Safety Information

To ensure safe operation and prevent damage to the product or your vehicle, please observe the following safety guidelines:

  • Do not disassemble, modify, or repair the device.
  • Keep the device away from water, moisture, and extreme temperatures.
  • Avoid dropping or subjecting the device to strong impacts.
  • Ensure the car charger is securely inserted into the cigarette lighter socket.
  • Do not operate the device if it appears damaged.
  • This product is designed for 12V vehicle power outlets.

For detailed safety information, please refer to the official Safety Information PDF.

3. Package Contents

The KEWIG Car Charger package includes:

  • 1 x KEWIG Car Charger (Model Z8-A)

4. Product Features

The KEWIG Car Charger is equipped with several advanced features for optimal performance:

  • Dual QC3.0 USB Ports: Two Quick Charge 3.0 ports deliver up to 18W (3A) per port, with a total output of 36W. This allows for rapid charging of two compatible devices simultaneously, up to 4 times faster than conventional chargers.
  • Colorful Voltmeter: An integrated LED voltmeter monitors your car battery's voltage in real-time. The colored lights (red, yellow, green) provide a quick visual indication of the battery level and charging status.
  • ON/OFF Switch: A dedicated button allows you to control the power to the voltmeter LED and USB ports, helping to conserve vehicle battery when the charger is not in active use.
  • Premium Construction: Manufactured with high-quality materials resistant to both high and low temperatures, ensuring reliable operation in environments ranging from -20°C to 60°C.
  • Advanced Safety Protection: Certified by UL, FCC, ROHS, and EMC, the charger incorporates a smart chip that provides protection against overvoltage, overcurrent, overcharge, overheating, and short-circuits, safeguarding both the charger and your devices.
Diagram showing multi-protection features of the car charger

Image 4.1: Illustration of the multi-protection features including overcharge, overcurrent, over-temperature, and short-circuit protection.

5. Setup

Installing your KEWIG Car Charger is a simple process:

  1. Ensure your vehicle's engine is off before installation.
  2. Locate the 12V cigarette lighter socket in your vehicle.
  3. Insert the KEWIG Car Charger firmly into the 12V socket until it is seated securely.
  4. Once inserted, you may start your vehicle. The voltmeter LED will illuminate, indicating power.
KEWIG Car Charger installed in a car's cigarette lighter socket, charging two smartphones

Image 5.1: The car charger properly installed in a vehicle's power outlet, demonstrating its compact fit and ability to charge two devices simultaneously.

6. Operating Instructions

The KEWIG Car Charger features an intuitive ON/OFF switch for controlling its functions:

  • Step 1: Activate Voltmeter and USB Ports

    Press the ON/OFF switch lightly. The voltmeter LED will illuminate, and both USB ports will become active, ready for charging.

  • Step 2: Turn Off Voltmeter LED (USB Ports Remain Active)

    Press the ON/OFF switch lightly again. The voltmeter LED display will turn off, but the USB ports will remain active, allowing you to continue charging devices without the visual display.

  • Step 3: Power Off Voltmeter and USB Ports Completely

    Press and hold the ON/OFF switch for approximately two seconds. Both the voltmeter LED and the USB ports will power off completely. This is recommended when the charger is not in use to prevent battery drain, especially if your vehicle's 12V socket is always powered.

To charge your devices, connect them to the USB ports using appropriate charging cables. The charger will automatically detect and deliver optimal charging current.

Diagram showing the ON/OFF switch functionality with voltmeter on and off states

Image 6.1: Visual representation of the ON/OFF switch operation, showing the voltmeter display active and inactive states.

6.1. Voltmeter Functionality

The colorful LED voltmeter provides a visual indication of your car battery's voltage:

  • Red Lights: Typically indicate a lower voltage, potentially below optimal levels.
  • Yellow Lights: Suggest a moderate or acceptable voltage level.
  • Green Lights: Indicate a healthy and optimal battery voltage.

This feature allows you to quickly assess your vehicle's battery health at a glance.

6.2. Wide Compatibility

The KEWIG Car Charger is designed for broad compatibility with a variety of devices and vehicle models. It supports fast charging for:

  • Smartphones: Including iPhone 14/14 Pro/13/13 Pro/12/12 Mini/12 Pro/12 Pro Max/11/Pro/Max/8 Plus/8/7 Plus/7/6S/6/6 Plus, Samsung Galaxy S21/S20/S10/S9/S8/S7/S6/Plus/Note series, Huawei Mate/P series, Xiaomi MI/MIX series, Nokia, Pixel, LG, HTC, BLU, OnePlus, and more.
  • Tablets: Various models compatible with USB charging.
  • Other USB-Powered Devices: Such as cameras, game controllers, and other portable electronics.
KEWIG Car Charger shown with various compatible devices like smartphones, a camera, and a game controller

Image 6.2: The car charger demonstrating its universal compatibility with a range of electronic devices.

7. Maintenance

To ensure the longevity and optimal performance of your KEWIG Car Charger, follow these simple maintenance tips:

  • Cleaning: Use a soft, dry cloth to wipe the exterior of the charger. Do not use liquid cleaners or solvents.
  • Storage: When not in use for extended periods, store the charger in a cool, dry place away from direct sunlight and extreme temperatures.
  • Inspection: Periodically check the charger for any signs of damage, such as cracks or loose connections. If damage is found, discontinue use.

8. Troubleshooting

If you encounter issues with your KEWIG Car Charger, please refer to the following common problems and solutions:

ProblemPossible CauseSolution
Charger not powering on / No LED display
  • Not properly inserted into the socket.
  • Vehicle's 12V socket is not receiving power.
  • Charger is in the "off" state (Step 3 of operation).
  • Vehicle's fuse for the 12V socket is blown.
  • Re-insert the charger firmly.
  • Check if other devices work in the same socket.
  • Lightly press the ON/OFF switch to activate (Step 1).
  • Consult your vehicle's manual to check and replace the fuse if necessary.
Devices not charging or charging slowly
  • Loose USB cable connection.
  • Damaged USB cable.
  • Device not compatible with fast charging.
  • Charger is in voltmeter-off state (Step 2), but USB ports should still work.
  • Ensure USB cables are securely connected to both the charger and the device.
  • Try a different USB cable.
  • Confirm your device supports Quick Charge 3.0 for optimal speed.
  • Press the ON/OFF switch to ensure USB ports are active.
Voltmeter LED is off, but USB ports are charging
  • Charger is in the voltmeter-off state (Step 2 of operation).
  • Lightly press the ON/OFF switch once to re-activate the voltmeter LED (Step 1).

9. Specifications

FeatureDetail
Model NumberZ8-A
Input Voltage12 Volts
Total USB Ports2 (Dual QC3.0)
Output (Each Port)18W / 3A
Total Output36W
Special FeaturesColorful Voltmeter, ON/OFF Switch
Operating Temperature-20°C to 60°C (-4°F to 140°F)
CertificationsUL, FCC, ROHS, EMC
Dimensions3.19 x 2.32 x 1.57 inches (Package)
Item Weight1.41 ounces

10. Warranty & Support

KEWIG products are manufactured to high-quality standards. For information regarding warranty coverage, please refer to the warranty card included with your purchase or visit the official KEWIG website.

If you experience any issues or have questions about your KEWIG Car Charger, please contact our customer support team. Contact details can typically be found on our official website or through your purchase platform.

We are committed to providing excellent customer satisfaction and support.

© 2025 KEWIG. All rights reserved.

Ask a question about this manual

Ask about setup, troubleshooting, compatibility, parts, safety, or missing instructions. Manuals+ will review the question and use this page’s manual context to help answer it.

After a successful submission, we securely hash the supplied account or form email before sending it to Microsoft Advertising for conversion attribution. Privacy details.