Electric Air Pump for Inflatable SUP Paddleboard ◯ Operation Unconfirmed, Sold As-Is (Junk) ◯

This was a gift, but the details are unknown.
It has been stored in a warehouse for some time.

The exterior appears to be in good condition as shown in the images.
The protective seal has not been removed.
The power turns on, and I have confirmed that it is receiving power and charging. I do not know how to operate it and there is no support, so further operation has not been confirmed.

As I am not familiar with this device, it will be sold as junk. Please refrain from purchasing if you have any concerns, as returns will not be accepted even if it does not work.
Please refer to the images for details.

Price negotiation is welcome.

Excerpt from Amazon:
20PSI Electric High-Pressure Air Pump: Designed for SUPs, air mattresses, inflatable boats, and other inflatable devices. It also supports automatic air deflation.
High-Speed and Powerful Dual-Stage Inflation System with Active Cooling System: Automatic dual-stage pump: Maximum speed of 350L/min in the first stage; maximum speed of 70L/min in the second stage. Cooling system operates at all stages.
LCD Display with Real-Time Pressure Monitoring and Auto-Off Function: Use the digital display to preset your desired pressure value and monitor the pressure in real-time. With the auto-off function, the compressor will turn off when the preset value is reached.
Powered by a 12V DC Car Connector and a Full Set of Nozzle Attachments: Connects to your car's 12V DC connector. Features a 12A fuse for increased safety. Comes with a full set of nozzles to fit most high-pressure inflatables, including C7 & H3 valves.