There was some noise occasionally. I bought these but ended up using wired headphones more, so I'm selling them. They support Hi-Res audio and allow for equalizer settings via a dedicated app. What I'm sending is only the earphone body, case, and bonus cover as shown in the photos. Please refrain from purchasing if you are looking for a perfect product, as this is a used item. Please check the condition of the product in the photos. • Hybrid Active Noise Canceling (up to 52dB) • High-quality sound with LDAC / Hi-Res Audio Wireless support • Multi-point connection support (smartphone + PC, etc.) • Up to 38 hours of long battery life (including case) • USB-C charging support