About this item Clear Audio Quality w/Dual ENC Noise Canceling Sunitec BH840 with rophone for pc, built in advanced 4X noise canceling , it helps eliminates background noise to make sure others can hear you clearly. In addition, the rophone's mute function is available for mobile phones and computers, so you can quickly mute your voice during a call. All Day Comfortable Lightweight BH840 designed to fits perfectly for your left or right ear, adjustable 180° swivel ear hook and 270° flip-boom arm for lasting wearing comfort, good for trucker teacher or business men. Wide Compatibility Idear for mobile and office professional who relies on their PC/Mac and/or mobile phone for on-the-go communication. Sunitec BH840 Compatible with rosoft Teams and other leading collaboration and voice platforms (connected directly if computer with bluetooth). Comes with USB Dongle It comes with a USB dongle in package, you can use our Bluetooth even there is no Bluetooth function in your computer. Note: If you connect computer via the USB dongle, Sunitec BH840+ bluetooth can't connect with two devices simultaneously Warranty Guarantee & Long y Life Up to 45 hrs of talk time and 60days of standby time & about 2hrs to fully charge. All bluetooth products from our company enjoy the lifetime after-sale service. We firmly believe you'll love our bluetooth device, and if you aren't absolutely satisfied, return them within 60 days for a refund, no questions asked.