<span>The distance at which wi-fi signals can travel ranges typically between 150 feet and 3300 feet. The former is most likely for indoor signals while the latter is for outdoor signals. </span>WIFI signals are affected by a number of factors like, power, antenna type and the environment. Hope this helps.
A machine. I foget the name but there can be a machine, or fresh air, or turning off your car, or opening doors and getting out when there;s a fire or smoke.
Answer:
test whether a user entered a value
