Those who train with shot timers, do they pick up other shooters at the range?

I go to an outdoor shooting range where you'll hear people shooting in other berms. I'm wondering if I can use a shot timer while someone else is shooting ~30 yards away behind a gravel barrier.I picked up a PACT timer because I got a great deal, which is why I'm concerned because it's got non-adjustable sensitivity. via /r/CCW https://ift.tt/0Rfz6xq