Hybrid Digital ANC Techology Bluetooth V5.0 Clear, balanced audio performance at any volume, and includes a noise-cancelling microphone for your important calls Up to 26 hours operating time; 23 hours (BT + ANC) Supports Mobile Voice Assistants with a touch of a button Soft, luxurious headband and earpads for comfortable all-day use Foldable for easy transport & storage Clear away the noise and distractions with V7s Bluetooth Wireless headphones. Our noise cancelling technology improves enjoyment of music, allows for deeper concentration of work, or whatever needs your focus. Thats the benefit of the HB800 Bluetooth Wireless headphones, theyre designed with hybrid ANC technology to continuously monitor and measure outside noise and reduce it with an opposing signal. You can also adjust the noise cancellation level to better fit your environment so you can work and concentrate without distraction. Performance Certification CE, FCC, RoHS, BQB Country of origin China Cable length 0.8 m