Free shot timer

[ExtremeX]

I'd be concerned about eventually damaging to the speaker and microphone in the phone.

Considering the phone is generally in my pocket or on the bench (ballistic calc) when I am at the range and subject to that environment and same sound pressure levels...

I don't think its actually had a negative impact in any way, none that I've realized over the years... may be a non issue, but it is possible.

[Sosoomi]

Is that an NFL linebacker running at you or a Krispy Kreme couch muffin tipping the scales at 330 pounds of pure fat who would be severely winded at 7 feet into his semi truck sprint!!

Neither..... Just another idiot that posts stupid stuff with no relevance!

[9mm1911]

I'd be concerned about eventually damaging to the speaker and microphone in the phone.

I've heard this too, but my app recommends I plug in headphones so it uses that speaker instead.

[sholling]

Considering the phone is generally in my pocket or on the bench (ballistic calc) when I am at the range and subject to that environment and same sound pressure levels...

I don't think its actually had a negative impact in any way, none that I've realized over the years... may be a non issue, but it is possible.

I tend to leave my smartphone in the car when I'm at the range.

I've heard this too, but my app recommends I plug in headphones so it uses that speaker instead.

Even using an external microphone and speakers you are still exposing the phone's built-in speaker and microphone to very high sound pressure levels, you just aren't using them to translate sound waves into electrical signals. Any wear and tear would be on the tiny diaphragms used in the speakers and microphones, not in the electronics.

I don't know if 140db is enough to damage the tiny transducers used in phones but my phone cost me too much to put at unnecessary risk.

[Mutenri]

Pretty sure you're missing tactical bottle opener somewhere in there.