Silipower Bluetooth Headphones, True Wireless Headphones, Stereo in-Ear Earpieces with Built-in Mic Earphone, Portable Charging Case Super Sound Quality with V4.1+EDR - Bluetooth 4.1 true wireless headphones with advanced audio technology. The built-in high-quality sound chip provides you with the crystal clear high & low frequencies. Two interconnection pieces are creating great stereo and excellent bass surrounding sound. Durable and Standby Time - Built-in 50 mAh Lithium Polymer Battery, Enjoy about up to 3 Hours of Premium Quality Talk/Play Time (Full Charge approximately 1-2 hours), up to 40 hours standby time. 430mAh Capacity Charging Case Can Provide 3-4 Times Longer Charge by USB. Ergonomic Design - Comfortable and Secure in-ear Earbuds, Soft 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. 3 sizes ear caps can fit all kinds of people. Single or Dual Wireless Earbuds - true wireless earbuds are a multi-point connection. This pair of true wireless Bluetooth earbuds can be used as one single earbud to keep an ear open for the traffic or use as a pair to enjoy music. They are compatible with hundreds of brands and other devices with Bluetooth function. Connects up to the 30 Ft in the open space, make your earbuds extraordinary. Multifunction and Ultimate Compatibility - Technology with voice notification of incoming calls. High dynamic range built-in microphone to make calls, with buttons on the earbuds allows you to Play/Pause on your favorite music tracks as well as Answer/Hang up phone call without reaching your phone. It is easier for you to handle your calls while driving. Our earbuds are compatible with hundreds of different mobile phone brands. The first true wireless earphones that satisfy all your needs.