When collaboration is easy, everyone is happy, with both their UC platform and their headset. Evolve 40 is UC-certified and available in a Microsoft Teams-certified variant, for truly seamless communication. Comfortable leatherette ear cushions and on-ear design for all-day comfort. Show those around you when you're on a roll and not to be disturbed, by activating the busylight. The handy little light automatically turns red when you're on a call to keep you from being interrupted, or you can enable it manually.