In the description, it says the inflator can inflate 7 tires. What size are the tires?                                  

When the product is fully charged, it can inflate seven 225/40 R18 tires from 0 bar to 2.5 bar and takes less than 6 min for each. Also, it can top off about thirty 225/40 R18 tires from 2.0 bar to 2.5 bar and the time is 1 1/2 min for each.

Does the product have any overheating protection? How will the battery performance be affected in extremely hot and cold environments?

The overheating protection will be triggered after the product works for ~ 20 min under a 77 ℉ environment. Please wait until it cools down and you can re-start it to inflate. Extremely hot environment may cause the protection occur in advance. Extremely cold environment may affect the battery performance or the product may not be able to turn on. Please put the product in an environment above 32 ℉ to use it. We highly recommend to store the product in the glovebox or somewhere else in the vehicle instead of the trunk.

Can the product charge any device at 45W? How about the recharging?

The output is determined by the protocol of the device to be charged. For example, iPhone 14 Pro support 27W of max charging speed. When you connect it to our product by the Type-C port, the output is 27W otherwise the battery will be damaged. If the cable does not support fast-charging, the output power will be affected too. 

Can the unit be toggled from bar to psi?

Yes, long pressing the second button and the unit will be switched. There are 4 units, i.e., bar, KPA, psi and kg/cm2.