These headphones with microphones also can be used as corded headphones with 3.5mm audio ,support (maximum 32G) and functions like a mp3 player Voltage ：3.7VDC (built-in 400MAH rechargeable battery) This headset uses a high-quality music chip to stable passive noise cancellation. Connect it to your device and enjoy H F, strong bass, clear, clear music all day long S/N rate ：70 dB The adjustable headband gives your headphones some flexibility so they can adapt to the shape of your head for a . charge time： 2-2.5 hour These incredible headphones support the mode. You can use TF / Card ( under32gb ). Does not contain a TF memory card. Microphone high integrity compatible with most smartphones. MP3, MP4, PC, , DVD, mobile, PC, laptop, , etc. 400 mAh high capacity rechargeable battery provides up to 6-10 hrs play back.Standby 250 hours. foldable design not saves space but also makes it portable. choice to take it study, outwork, travel. talking time ：6 -10hour Version: V5.0 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 works in the wireless mode.) Seven-color transform cool breathing light, shine everywhere, anytime. 1 x USB charge Power :≤ 4 , class 2 support： A2DP 1.2, AVRCP 1.0, HSP, HSF 1.5 Battery Capacity: 400mAh standby time ：220hour Distortion： 0.10% Sensitivity ：-84dBm / 0.1% BER Speaker size： 40mm 1 x the colorful headset (Please choose color) Acoustic E-cho cancellation and noise reduction effectively reduce ambient noise while talking, make far-end listener cannot hear what you said become , just like talking face to face. 9. Supports up to 32G and comes with FM stereo Frequency response ：20 Hz - 20 KHz Frequency: 2,402-2,480 , 2,4 G -Band Effective range L:10M These Incredible Headphones Support The Mode. You Can Use TF / Card ( Under32gb ). Does Not Contain A TF Memory Card. Microphone High Integrity Compatible With Most Smartphones. MP3, MP4, PC, , DVD, Mobile, PC, Laptop, , Etc. Talking Time ：6 -10hour Version: V5.0