How do you charge the device?

actually it came mostly charged it was in the 90 percentile. but i went ahead and charged it to the full 100 percent. cant say that yours will be charged that high. but mine was. hope this helps

Can I use two USB sockets at the same time to charge each of my two mobile phones?

Of course, I also have two phones, but charging two phones at the same time slows down the charge, but that's okay, it's got a big battery!

Can its 12V/10A interface connect my car hoover and tire inflation pump?

Its cigarette lighter interface can start any appliance under 120W, as long as your tyre pump and car vacuum are appliances under 120W, there is no problem.

Manufacturer	CARHEV
Brand	CARHEV
Model	JS-01
Item Weight	2.2 pounds
Product Dimensions	7.48 x 3.54 x 1.57 inches
Item model number	JS-01
Batteries	1 Lithium Ion batteries required. (included)
Manufacturer Part Number	JS01
Amperage	27 Amps

CARHEV 3000A Jump Starter, 24000mAh Car Battery Jump Starter (up to 8.0L Gas and 8.0L Diesel Engine) Battery Jumper Starter Portable, 12V Car Jumper Starter Portable with LED Light and USB QC 3.0

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