DF7, the latest Bluedio headset of 2014, is perfectly upgraded with Bluetooth 4.1, smart touch button, exclusive APP, silicon microphone, providing you with the most advanced technology. Apart from these, DF7 also can satisfy your most basic needs of Bluetooth headset, such as long working time, voice prompt, multi-pointing and circuit protection. What we strive for is the best Bluetooth headset for you. Specifications: Color: black,white Bluetooth version: V4.1 Supported profiles: A2DP、AVRCP、HSP、HFP Driver unit: Φ 10mm Speaker impedance: 16Ω Sensitivity: 110dB Distortion: <0.1%(THD) Frequency response: 20Hz-20KHz Operating distance: up to 10m Talk time: up to 8hrs Music time: up to 8hrs Standby time: up to 180hrs Fully charged time: about 2hrs Headset size: 18×8×55mm Package size: 169×50×200mm In the box: DF7 headset 1pc Stereo earphone 1pc USB charging cable 1pc Ear tips 2pcs Ear hooks 3pcs（S,M,L) User manual 1pc About Bluedio Bluedio is a manufacturer pioneer in portable audio device, providing solutions of professional audio and wireless communication. In 2009, we have registered Bluedio as our trademark in the USA, later obtained certificates from China and the whole world. So far, Bluedio has owned over 30 patents, highly praised by consumers from over 34 countries.