The A4Tech BH220 in black is a pair of wireless headphones designed for those who value long-term comfort and reliable connectivity. Using Bluetooth v5.3, these headphones maintain a stable connection up to 10 meters away, while the 400mAh lithium battery provides up to 40 hours of playback on a single charge. You can easily keep them powered using the included 0.5 m USB Type-C cable. These headphones are built with a unique combination of materials, featuring a metal adjustable frame and M.O.C.I. components made from nano mycelium and carbon fiber. The headband and earpads are wrapped in mesh fabric, which helps keep your ears cool during extended listening sessions. Inside, 40mm hybrid diaphragm speakers deliver a frequency range from 20Hz to 20KHz with 100dB sensitivity, ensuring a balanced sound for various types of media. For communication, the built-in omni-directional microphone uses ENC technology to help clear up your voice during calls. You can manage your audio and phone conversations directly from the earcups using the integrated controls for volume, track navigation, and call handling. This black model is a durable daily companion for music and work.