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The CC 510 can also be converted to an on-the-ear headset with the addition of the Earloop Conversion Kit from Sennheiser.
The CC 510 headset and CSTD-01 cord from Sennheiser are a great solution for use with many corded office phones with internal amplifiers, such as Northern Telecom phones. If you're unsure whether your phone has an internal amplifier, give us a call at 1-800-HEADSETS (1-800-432-3738), and we'll be happy to check on compatibility for you.