QY21 Jump Starter Air Compressor

QY21 12V Jump Starter Air Compressor is a multifunctional emergency car device designed to help start a vehicle with a weak battery and inflate tyres when needed. It combines a car jump starter, portable air compressor, power bank and LED flashlight in one compact unit.
 
 
How to use the QY21 Jump Starter Air Compressor
 1. Jump-start a car
1. Make sure the QY21 has sufficient charge.
 
2. Turn the QY21 off before connecting the clamps.
 
3. Connect the red (+) clamp to the car battery’s positive (+) terminal.
 
4. Connect the black (−) clamp to the negative (−) terminal or a suitable vehicle ground.
 
5. Turn on the QY21/jump-start function.
 
6. Start the vehicle.
 
7. Once the engine starts, remove the clamps promptly—black (−) first, then red (+).
 
8. Turn the QY21 off.
 
Important: Do not allow the red and black clamps to touch each other.
 
 
 
 
  Inflate a tyre
1. Turn on the QY21.
 
2. Connect the air hose to the tyre valve.
 
3. Check the pressure shown on the digital display.
 
4. Set the desired tyre pressure using the controls.
 
5. Start the Air Pump.
 
6. Allow it to inflate until the desired pressure is reached.
 
7. Stop the compressor and disconnect the hose.
 
Tip: Check the recommended tyre pressure printed on your vehicle/tyre information rather than guesssing the pressure.
 3. Use the flashlight
Press the flashlight/light button to switch the LED light on. It can be useful when working around the vehicle at night.
 4. Use as a power bank
Connect your phone or compatible device to the QY21's charging output using the appropriate charging cable, then activate the power-bank function if required.
 
 
I would describe it as a 4-in-1 emergency device: Jump Starter + Air Compressor + Power Bank + Flashlight.