Legally shaky ground? Lol.
No.
Not in the US. Unless this is all laid out specifically in the contract, there’s nothing preventing from an employee coming in on an off day and doing some work, legally speaking.
Your employer can decide you’re not supposed to be there and tell you to go home, mind. What days you work or don’t work are between you and them. You doing extra work as a salaried employee is gonna look at as you doing favors.
Boss probably doesn’t care, though.
fobs don’t turn off. but the car sends a signal to the fob, the fob responds in kind. fobs don’t constantly transmit
the farraday cage blocks the intial signal sent by the car. Or as already noted; by the guy standing near enough to get it. (frequently still outside the house.) who then relays it to a guy in/at the car.