No issues here. The caller sounded clean and clear, and the microphone had good sensitivity as well. Bluetooth and Supported Codecs These earbuds also use a USB-C connection for charging, which is preferable to micro-USB. More durable and faster charging time. Sennheiser offers an accompanying app that, with higher priced models, allows you some added control over your headphones, such as the ability to change equalizer settings. When I paired the app with the more affordable, CX 150BT, it didn’t offer any extra features. But this time, when I paired the app with the CX 350BT, it showed an equalizer button that says “coming soon.” So, hopefully, after the next update, these earbuds will have an equalizer. And I don’t know of any other wireless earphones at this price point that offer this neat feature. Oh, the app also has a battery life indicator. Forgot to mention that in my other review. SOUND Lows Like the CX 150BT, the CX 350BT supports AAC, which is a hi-res codec for iPhones and Androids. But unlike the CX 150BT, the CX 350BT also offers aptX Low Latency, which ensures that your videos will play in sync with your audio. (Sorry Apple folks, iPhones don’t support the aptX codec). Extra Features

Like the CX 150BT, the CX 350BT supports the Bluetooth 5.0, which is the latest Bluetooth version. And in theory, it might mean fewer dropped signals. Like the CX 150BT, the CX 350BT offers 10 hours of battery life. This is on the higher end of standard for wireless earbuds at this price point. Similar Audio-Technica models, for example, only offer 8 hours of playtime.

What’s it like to use the Sennheiser HD 350BT?