Circle™ SC 238 and SC 268 are wired headsets optimized for high impedance/narrowband desk phones. Designed for contact center and office professionals requiring outstanding sound performance, durability and all day wearing comfort. Variants Choosing the right Circle™ Monaural headset - Hear what's going on around you A single-sided wired headset for users in busy contact centers and offices, who require outstanding sound performance while maintaining contact with their surroundings. Binaural headset - Stereo sound for maximum focus A double-sided wired headset for users in busy contact centers and offices, who require outstanding sound performance in noisy environments. Voice Clarity Speech intelligibility in noisy environments Sennheiser Voice Clarity and a noise-cancelling microphone optimize speech intelligibility in noisy environments. Features leatherette ear pads and Sennheiser ActiveGard® acoustic shock protection. Designed for contact center and office professionals requiring outstanding sound performance, durability and all day wearing comfort.