Specifications: Driver diameter:40mm Impedance:32ohm Sensitivity:82dB +/- 3dB Frequency range：20-20000HZ Cable length:1.2M micphone：yes Charging port:5 Pin micro usb Bluetooth protocol standards:4.0 Receiver frequency:15m Battery:500MAH standby time:200（hours) Successive working time:10(hours) SF-999 is a closed back, around-the-ear Bluetooth headphone specially designed for music lovers wanting an unique, sophisticated appearance, luxurious and faddish wearing comfort and rich, detailed stereo sound.The headphone boasts soft breathable leather headband and supple ear pads and a foldable ear cup slider providing maximum durability and a custom fit. A standard connection cable provides an other choice to connect your devices. Why SoundFriend? SoundFriend is the brand of choice for many music lovers, delivering the ultimate audio experience to people who crave true-to-life sound. SoundFriend focuses on optimizing the user experience, providing users a best and stereo audio. Highlights *Closed, around-the-ear headphone design reduces ambient noise. *Breathable leather headband and ear cups for optimum perspiration and water resistance. *Constructed with premium materials. *Built-in microphone provides clear phone calls.
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