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 songs Built-in FM radio function, FM frequency range: 87.5-108 MHz 40mm dynamic alloy speaker controller, ultra-high fidelity stereo surround sound tuning, enjoy high quality wireless music Built-in hidden HD microphone for hands-free calling With standard 3.5mm audio jack, compatible with line output playback mode, you can use 3.5mm audio cable to listen to music Foldable and lightweight, the earmuffs are made of soft, breathable protein leather for a comfortable fit Removable and replaceable battery design, 400mAh lithium ion polymer battery, standby time up to 20 days, playback time up to 8-10 hours Specification: Model: B570 Bluetooth version: 4.0 + EDR + class2 Bluetooth protocol: AVRCP1.0, GAVDP1.0, AVDTP1.0, A2DP1.0 Wireless transmission range: 10 meters Music/talk time: 8-10 hours Charging time: 5 hours Frequency response: 20Hz-20KHz Battery type: rechargeable lithium ion polymer battery (3.7V 400mAh) Charging power: USB port of the computer DC 5V Audio port: 3.5mm stereo jack Compatible with: iPhone Samsung Huawei Sony HTC LG etc. Bluetooth-enabled smartphones or tablets Other MP3/MP4, PC etc. with 3.5mm audio jack Package included: 1 x ZEALOT B570 Bluetooth Headphone 1 x USB Cable 1 x English and Chinese User Manual Other items not included