Holiday Shipping Details & Extended Holiday Returns 
1. This car charger adapter with colorful voltmeter and independent power switch design. The car charger can be switched to different working states by lightly touching and long pressing the switch.
2. When the car charger does not charge mobile device, the colorful voltmeter displays the real-time voltage value of vehicle; When car charger charges mobile device, the colorful voltmeter does not display the real-time voltage value of vehicle.
3 When car charger charges mobile device, the colorful voltmeter will flash and rotate, and the frequency of rotation indicates the charging rate. You can lightly press the ON-OFF switch, the colorful voltmeter will stop flashing and rotating, and the car charger can still charge your device at this time. Long press the ON-OFF switch for about two seconds to turn off the power of the car charger USB port & colorful voltmeter. At this time, the car charger is in a non-working state.
This dual QC 3.0 car charger built-in intelligent control chip and fuse: provide overcurrent protection, overvoltage protection, overtemperature protection, overcharge protection, short circuit protection, reverse wiring protection. Ensure the safety of your charging device and vehicle battery.