CS55 Wireless Earset With Lifter allows you to conduct business calls in hands-free, digitally enhanced audio. Convertible over-the-ear, over-the-head or behind-the-head styles. Lets employees go where office work takes them, up to 300' from their desks for 10 hours of unencumbered talk time. As the first headset in the United States to implement 1.9GHz voice-dedicated wireless technology, the CS55 delivers uncompromised audio quality and ensures minimal interference from other office wireless systems. Extended boom and noise-canceling microphone enable crystal-clear voice delivery even in loud environments. Built-in answer/end call features.