The Jabra Evolve 75 UC is a headset with professional grade noise-canceling technology. This headset allows easy connection as a wireless headset to a PC, any smartphone or a tablet. It is equipped with world-class speakers and HD Voice with Dual Bluetooth connectivity so that you can pair to two wireless devices simultaneously, with no interruptions to stop to pair a new device. Stereo Headset Made For Voice & Music Superior Active Noise Cancellation On the Ear Cushions Noise Canceling Microphone Integrated Busylight Dual Bluetooth® Connectivity Discrete Boom Arm Multi-Device Connectivity Works with all UC Platforms Certified for Skype for Business & Cisco 33 Meter/100 Feet of Wireless Freedom Up to 15 Hours Battery Life Leather-Feel Ear Cushions Connects to PC, Mobile & Tablet via Bluetooth Easy-to-Reach Button on the Ear Cup Over-The-Head Wearing Style Easy Charging & Docking Outstanding sound for calls and music Microphone frequency range 150 hertz - 6.8 kilohertz.New with manual