Highlights Using the latest Bluetooth 4.1 wireless technologies to provide high-fidelity wireless music enjoyment. Exclusive design patents, headphone ergonomic design, comfortable to wear easy to fall. Ear ear design, reducing the world's best bass. Military-grade silicone earplugs, isolated from outside noise. Built-in high sensitivity microphone, clearer voice quality. Built-in lithium battery, support for 2 hours fast charging, provide up to five hours of music / talk endurance. Bluetooth one with two to meet the needs of multi-source. With a play button, you can control the music player and make and receive calls and other functions. Precision waterproof design, to effectively prevent sweat, rain water splashes. Product Specifications Bluetooth version: bluetooth 4.1 Frequency range: 2.4 GHz to 2.4 GHz Job scope: > 10 meters (disabled) Standby time: > 180 hours Life time: > 5 hours Charging time: 2 hours Support agreement: A2DP, AVRCP, HSP, HFP Frequency response: 20 hz - 22 KHZ Products include: 1 * Syllable D700 1 * charging line 4 * earmuffs 1 * box
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