Loud Bluetooth Amp

[zdog16]

I have kinda an odd situation. So here is a bit of setup...

I work at an church that has multiple campuses across the county and we stream the sermons 'live' between the campuses on Sunday mornings. Obviously this requires a lot of communication and ordination. We use UHF radios for on campus communication and a ClearCom VOIP system for real-time campus to campus communications. Recently we got an add on for the VOIP system that allows us to use cell phones as com boxes in addition to the wired belt-packs that are in the sound booth at each campus. This is great because we don't have to be tethered to the desk with the ClearCom. I wear an IFB for my radio so I can hear what's happening on the security channel, but I also want to listen to the VOIP system so I bought an IFB that has a 3.5mm headphone input for my phone. 

 

Now here's my problem, the volume level on the 3.5mm input is super low. In a quiet room I can hear the VOIP system, but as soon as there is any sort of background noise it's inaudible. What I think I need is an Amp that can boost the level to something that's audible. I don't really care about audio quality, the earpiece that I use is not designed for high quality sound I just need volume. I tried this one cause it was super cheap and I thought I'd give it a try, but it seems mainly to EQ the sound and really effect volume. What amps would you guys suggest? I would love for it to be Bluetooth, purely for the convenience of not having my phone tethered to me all the time but it's not a requirement, also if there are any options available with lighting cable that would be great also as my current Phone is an iPhone X and again not having to use an adapter is just more convenient.