In-Ear Sport Earbuds,Dacom Wireless Stereo Bluetooth Sweatproof Headphones for Running, Workout, Gym Sports Earphones with Mic 1. Advanced Bluetooth 4.1 version with CSR8645 chip. The powerful technical support makes your usage go smoothly. 2. The effective distance makes you more causal. You can put them in the bag and enjoy your own things at a good distance without any limitations or signal interference. 3. Ultra-clear sound quality will definitely make you impressed with the ease of pairing to all of your devices. The terrific acoustics is demonstrated via a deep responsive bass with a full mid and high range. 4. Comfortable to wear, easy to set-up and get paired, lightweight and portable enough to take. It is quite convenient for you to take exercises or keep on moving. 5. Diverse functions provide you a variety of choices: 2-Link function; NFC function; Voice reminder; Telephone number redial. It is not only a Bluetooth headphone, and it is also a good life and business helper.