High-Quality Stereo Sound Powerful 40mm drivers with deep base and a wide dynamic range deliver an exceptional listening experience at an affordable price. Best-in-Class ComfortB Designed to fit heads of all ages, the adjustable headband is padded, the flexible boom-style microphone can be rotated up to 270 degrees, and the foam ear pads are wrapped in a soft leatherette cover to provide hours of comfortable use. Noise-Cancelling Microphone Uses passive resistance technology to filter out ambient noise for optimum speech clarity. Single-Sided Monitoring Enabled The ear cups swivel to enable teachers or call center instructors to listen in and support. 6 Foot Cord Offers the ideal length for learning environments and is strong enough to stand up to the heavy use requirements of K12 and call centers. Multi-Device Compatibility Works with Windows, Mac and Chromebook devices. Safe Listening Limit Sets the maximum output to 94db to protect ears from hearing loss associated with extended periods of excessively loud noise.