This is a sleek design voice-activated business style Bluetooth headset, suitable for all-day hands-free use with 20 DAYS standby time and 10 HRs talk/music time. 
 with 270 degrees adjustable tip, you will get a perfect hands-free experience for all-day use. 
Buy the ones with charging/carrying case and you can use it without charge for 50 HRs
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The Legend V9 Mini Wireless Bluetooth 4.0 Headset with Voice Command Auto-Answers for iPhone & Android has some really thoughtful design for an enhanced hands-free experience. It delivers calls from paired cellphones via Bluetooth 4.0 and can pair and maintain a connection with two devices at the same time.
The best part, however, is that the Legend V9 is equipped with call announce and voice commands, which announces incoming caller′s name or number and lets you say "yes" to accept the call or "no" to decline. Cool, huh? Don′t hesitate to get it! 

Meanwhile, it can stream A2DP music, letting you enjoy music anywhere, anytime. 
FEATURES

High quality HD sound 

Voice recognition, say yes or no while setting up or answering

Connect to two phones at the same time!

Wireless using Bluetooth 4.1 :BLUETOOTH 4.1 EDR APTX, CSR chip] provides you with a stable signal. compatible with all smartphones. 
The Bluetooth operating range is 33 feet (10 meters)

Music playing time 10 hours, standby time 20 days smart LED indicator. Power and volume buttons are easy to access and control.

Noise-canceling for background and wind noise: Triple-mic technology eliminates background and wind noise.  so you can enjoy a crystal clear sound!

Sweat-proof and water-resistant

270 degrees adjustable tip for maximum comfort with the best angle, and it's possible to wear it on the left or right ear 

Compatible with all devices that support Bluetooth, phones, laptops, computers, TV and more

Also, available with a charging case