[Super Sound Quality with V4.2+EDR] Built-in A2DP /AVRCP Audio Processing System Which Eliminates Noise and Echo. High Quality Chip for Stereo Sound and deep Bass Sound .Clear High & Low Volume . It's Easy To Take and Make Calls ,Voice Dialing with Superior Microphone Quality. Ideal for taking Calls in the car, chatting with Friends, or for use at work. [Durable and Standby Time] Built in 60 mAh Lithium Polymer Battery , Enjoy up to 4 Hours of Premium Quality Play Time or 4.5 Hours Talk Time (Fully Charge in approximately 1-2 hours), up to 120 hours standby time. 500mAh Capacity Charging Case Can Provide 3-4 Times Longer Charge by USB . [Ergonomic Design] Comfortable and Secure in-ear Earbuds ,Soft silicone Material To Protect Ears, Make Your Phone Call and Music Time More Comfortable. Ear Hook Design Can Be Perfect for Sports, Jogging & Gym Exercise, Watching TV, or Sleep .