Jabra PRO 920 Mono

These wireless professional headphones feature a built-in microphone with noise cancellation. They offer 8 hours of usage time, cover up to 120 meters, and fully charge in less than 3 hours. The headphones can include up to 4 people for conferences and have various buttons for call control, volume adjustment, and muting. They automatically turn off when not in use and support mechanical handsets and remote controls.

• The description claims the headphones can include up to 4 people for conferences.
• The description claims the headphones support mechanical handsets and remote controls.