The SoundMagic E10BT is what the name says, an E10 with Bluetooth connectivity. As with Pacific Rim manufacturers, the grammar in and accuracy of the information are questionable. The Bluetooth version is 4.0 or 4.1, depending on whether you look at the box or the instruction manual. Some stores and review sites claim that E10BT supports v. 4.2. What is also unclear are the Bluetooth profiles that the E10BT supports. Testing the earphones on YouTube and Amazon Prime Video, the delay in syncing video with audio suggests that absence of Qualcomm's AptX low latency audio transmission algorithm. Therefore, the version probably isn't 4.1. Sometimes the audio cuts off when seeking within a video or when changing videos. This occurred when using a 2017 Apple iPad as well as the Xiaomi Redmi Note 4 (Android). A battery indicator icon did appear on my Android phone's screen, so this suggests Bluetooth version 4.0 or higher. The voice prompts are the same as the ones employed by cheap Bluetooth speakers and earphones. Remember, you can pair only one device at a time.
The sound produced by the SoundMagic E10BT is not markedly different from the E10C. Of course, this also depends on which ear tips you use and how well they fit in your ear canal. The E10BT sounds just as flat as the E10C or the E10. It's hard to tell if this an upgrade. Other reviewers have praised the wired E10 and E10C for their "warm" sound and "smooth" treble. Indeed, they certainly don't sound harsh, but they do lack punch.
The E10BT is made only in one colour, a matte black. It's hard to tell, but their construction appears to be plasticky. The inline remote is unnecessarily large and looks very different from the polished images and videos published by SoundMagic on YouTube and their website. The micro USB charging port cover is flimsy and care should be taken not to rip it off. Like with the E10C packaging, the E10BT's packaging also displays an invalid webpage to verify the authenticity of your product. When turned on, the remote LED continuously emits an obtrusive blue light - so much so that I may colour the LED window black.
Call quality is especially good for the listener. In fact, listeners reported better call quality than using the microphone on my phone. However, the listener's voice sounded tinny through the earphones like a radio with poor reception. That said, it is possible to have hassle-free conversations on the phone with the E10BT.
Battery life drained from 90% to 30% in about 6 hours.
