Bluetooth V4.0 version, wide compatibility, suitable for mobile phone, tablet, laptop, MP3, MP4, etc.Supports 32G TF card expansion(TF card not included)Designed with LCD screen, to show the current play mode or switch songsBuilt-in FM radio function, FM frequency range: 87.5-108 MHz40mm dynamic alloy speaker controller, ultra-high fidelity stereo surround sound tuning, enjoy high quality wireless musicBuilt-in hidden HD microphone for hands-free callingWith standard 3.5mm audio jack, compatible with line output playback mode, you can use 3.5mm audio cable to listen to musicFoldable and lightweight, the earmuffs are made of soft, breathable protein leather for a comfortable fitRemovable and replaceable battery design, 400mAh lithium ion polymer battery, standby time up to 20 days, playback time up to 8-10 hoursSpecification:Model: B570Bluetooth version: 4.0 + EDR + class2Bluetooth protocol: AVRCP1.0, GAVDP1.0, AVDTP1.0, A2DP1.0Wireless transmission range: 10 metersMusic/talk time: 8-10 hoursCharging time: 5 hoursFrequency response: 20Hz-20KHzBattery type: rechargeable lithium ion polymer battery (3.7V 400mAh)Charging power: USB port of the computer DC 5VAudio port: 3.5mm stereo jackCompatible with:iPhone Samsung Huawei Sony HTC LG etc. Bluetooth-enabled smartphones or tabletsOther MP3/MP4, PC etc. with 3.5mm audio jack