Feature:1.Bluetooth headphone Fit Everybody:No matter you are office worker or student, teenager or girls.Devices with all sorts of smart phones, tablets, computer or music player. Cordless bluetooth headphones feature high fidelity &heavy bass,they suppress noise and provides you with a crisp clear sound during music or phone calls.2.3 in 1 Multi-Functions:These bluetooth headphones with microphones also can be used as corded headphones with 3.5mm audio cable,support tf card (maximum 32G) and functions like a mp3 player3.Space-saving:foldable design not only saves space but also makes it portable. Best choice to take it study, outwork, travel.4.Long Battery Life:400 mAh high capacity rechargeable battery provides up to 6 hrs play back.Standby 250 hours.5.Convenient Hands-Free Call:High-quality Built-in Microphone and volume control make it easier to pick up any incoming calls and enjoy voice chat or call communication when you are listening music. Never worry about miss any phone call.(But please note that the built-in microphone only works in the wireless bluetooth mode.)6.Adjustable Hinge:The adjustable headband gives your headphones some impressive flexibility so they can adapt to the shape of your head for a perfect fit.7.Stereo Hi-Fi Audio:This headset uses a high-quality Bluetooth music chip to ensure stable passive noise cancellation. Connect it to your device and enjoy high fidelity, strong bass, clear, clear music all day long8.Wide applicability:These incredible headphones support the TF card mode. You can use TF / Micro SD Card ( under32gb ). Does not contain a TF memory card. Microphone high integrity compatible with most smartphones. MP3, MP4, PC, PCD, DVD, mobile, tablet, PC, laptop, MAC, etc.9.Supports up to 128G TF card and comes with FM stereo radio10.Colorful LED Light:Seven-color transform cool breathing light, shine everywhere, anytime.11.CVC6.0 Noise Cancelling:Acoustic echo cancellation and noise reduction effectively reduce ambient noise while talking, make far-end listener cannot hear what you said become history, just like talking face to face.Specification:Version: V5.0Frequency: 2,402-2,480 GHz, 2,4 G ISM-BandPower : 4 dBm, class 2Effective range L:10MSensitivity -84dBm / 0.1% BERFrequency response 20 Hz - 20 KHzS/N rate 70 dBDistortion 0.10%Speaker size 40mmsupport A2DP 1.2, AVRCP 1.0, HSP, HSF 1.5Voltage 3.7VDC (built-in 400MAH rechargeable battery)talking time 10 hourstandby time 250hourcharge time 2-2.5 hourBattery Capacity: 400mAhoperate temperature -4 ~ +131F(-20 ~ +55C)Pacakge:1 x the colorful bluetooth headset (Please choose color)1 x micro USB charge cable1 x instruction guide1 x 3.5 mm audio cable