The AU-Frequency true wireless earbuds represent value and quality down to the finest details. Engineered with the same state-of-the-art Soundproof noise-canceling technology found in our high-end headphones, the AU-Frequency offers near-perfect sound balance. Award-winning AU PEEK PU Dynamic driver, with a frequency range of 20Hz - 20kHz. Superior audio performance with one simple touch. At Ausounds, performance is the sum of all these features and more. Because when innovation is about more than just the sound, there's always something new to discover.