Audiology Carbon Wireless Bluetooth Headphones, Noise Cancelling Headphones, Hi-Fi Stereo Wireless Headset with Built-in Mic for PC/Cell Phones/TV BLUETOOTH V2.1 TECHNOLOGY: Our bluetooth wireless headphones help you stream high-quality audio from your laptop, phone, and other Bluetooth enabled devices. Over 5 hours of continuous play back WIRELESS & RECHARGEABLE: USB charging cable included (no batteries required) and Compatible with all standard 3.5 mm jacks. LIGHTWEIGHT, COMFORTABLE DESIGN CUSTOMIZABLE FIT: Adjustable headband provides of these wireless headphones bluetooth headset a perfect fit. BUILT-IN MICROPHONE: Our portable bluetooth wireless headphones has a Built-in microphone allows clear Phone communication; Enables use as a headset. Music and phone controls ensure ease of use Works with most smartphones. EAR-CUP REMOTE CONTROL: your music & phone via Bluetooth You get on-ear music/call controls saving you the trouble of having to take the headphones on and off during your intense music listening experiences. Answer incoming calls with a touch of a button Adjust volume, charging songs, and answer phone calls. The sound is powerful and clear, you can switch easily between music and calls with intuitive controls, and play for hours with a long-lasting rechargeable battery. They&#039;re 40% lighter than comparable headphones for a comfortable fit. Its easier than ever for you to unplug and unwind. Enjoy detailed and balanced sound that raises the bar for Bluetooth headphones. With up to 5 hours of play time, you can listen to your favorite music, watch a movie, check out videos and still have plenty of power left. Get a full charge in just 2-2.5 hours by plugging the included USB cable. The adjustable headband rests gently on your head, soft cushions cradle your ears, and all materials are lightweight and built to last. And there&#039;s an extra cable, so you can plug in and listen if the battery runs out. If you get a call while you&#039;re listening to music or watching a video, just touch a button on the right ear-cup and you&#039;re instantly connected. Touch again to play, pause, skip and make calls. Roam up to 50 feet while connected to your smartphone and tablet at the same time. Voice prompts tell you battery life. Dual microphones reduce background noise to make sure your voice is heard. And you&#039;ll hear your caller&#039;s voice clearly Bluetooth: v2.1 Charging time: 2-2.5 Operating distance: 10-15m 33-50 Feet Operating current: 60 mA Operating temperature: 14F-122 F Sensitivity 84 DB Freq. response 20HZ-20KHZ Freq. range 2.402-2.480GHZ.2.41ISM Band 250+ Hours standby /5+Hours stander talk time. Bluetooth: v2.1 Charging time: 2-2.5 Operating distance: 10-15m 33-50 Feet Operating current: 60 mA Operating temperature: 14F-122 F Sensitivity 84 DB Freq. response 20HZ-20KHZ Freq. range 2.402-2.480GHZ.2.41ISM Band 250+ Hours standby /5+Hours stander talk time.