i am confused between these media queries..please help

if these two media queries are applied in a css:

@media only screen
and (min-device-width : 320px)
and (max-device-width : 480px) {
/* Styles */
}


@media only screen
and (min-width : 321px) {
/* Styles */
}


and the device is having width 340px then will both of these will work for that device??