SNOW DEER Heated Socks,Men Women Electric Battery Socks Foot Warmer

It says this is the new model, what’s the different vs the old ($59) model?

How do you know what setting they are on? I dont see any indicator that they ate on or working....

What is the return policy? (How long do we have to return them, and do they pay for return shipping?)

My feet are somewhere between 8.5 to 9. You’re difference between medium and large lands right in the middle. Do you recommend going smaller or larger