There are four separate components to the EarPrint app. One is a Sound Level indicator, which lets you know how loud the surrounding area is by measurement of decibels. Another is the Personal Sound mode, which acts as a personal audio equalizer that lets you fine-tune incoming audio. The Personal Sound interface is that of a grid, and depending on where you tap your finger, you can adjust the volume and tone of the audio. We found this to be a great tool, especially since not all our callers sound the same. Still, we wish a lot of this were more automated, since we didn't feel like fiddling with the Personal Sound tool all the time.
The EarPrint app also has a Tools section, which lets you toggle the in-call status indicator, a noise reduction demo, and the "Environmental" mode. The Environmental mode essentially lets you listen to the surrounding noise when your headset is plugged in. You can have it set for either Surround or Focused (Focused would be if you want to listen to only the person next to you, for example). We're not huge fans of the "Environmental" mode--why not just take off your headset?--but we can see how it could come in handy.
Also in the Tools section is a Find My Headset locator, which is very useful. Say you happen to lose your headset somewhere; you can just tap that locator button, and the headset will begin to squeal an alarm that is soft at first, and then gets louder. Finally, you can check out your headset's battery life using the EarPrint app as well.
Other features of the headset include the usual answering, ending, and rejecting calls, last-number redial, and the capability to transfer calls from the headset to the phone and vice versa. It also has multipoint, which lets it connect to up to two different devices simultaneously. Even though it doesn't have A2DP at the moment, Sound ID promises a firmware upgrade later on in the year that will have that as a feature update.
We paired the Sound ID 510 with the Apple iPhone 3G. We were very pleased with the call quality on the whole. Thanks to the Sound ID 510's capability to fine tune the incoming audio quality with the iPhone app, we managed to get the best possible incoming audio from our callers.
Similarly, the Sound ID 510 has very good outgoing call quality, thanks to the three microphones and Sound ID's 3x Noise Navigation. Callers could hear us clearly for the most part, though they did detect the occasional static. Their one complaint was that we sounded a tiny bit soft sometimes. When we turned off the noise cancelling for demo purposes, they said they definitely heard a lot more background noise, especially when we were in a crowded restaurant, so we think the noise-cancellation works as promised. It performed admirably during windy conditions as well.
The Sound ID 510 has a rated battery life of 5 hours talk time and 5.62 days.