Drive unit: 40 MMSensitivity:105 dB±3dBImpedance: 32 Ω±15%Frequency Response: 20 HZ-20 KHZBluetooth distance:10mPlay time: 36hStandby time: 360hCharging time: 2-3 h (goes out after full charged)Charging port: Micro USB 【LED Colorful Design】 This B39 over ear wireless headphones design with Round loop LED lighting up,Lighting of seven colors, red/blue/green and so on,the colorful lights change along with the rhythm of music on both sides of Bluetooth headphones,listening to music is more dynamic and unique. 【HiFi Stereo Foldable Headphones】 Powerful 40mm speaker and Bluetooth 5.0 technology provide more stable transmission speed，intelligently and fastly to connect bluetooth,360-degree surround stereo sound quality,make hearing more enjoyable. 【Wireless & Wired Switch】 The LED will light up for Bluetooth connect work,press three time Play/Pause key will close the LED light,you can choose to turn off the LED blinking effect so as to reserve more battery for longer music playing,when wireless headphones has run out of battery,3.5mm wired can work as wired headphones.Anyway Can be controlled according to your preferences. 【Friendly to Carry】 B39 Bluetooth headphones over ear design with freely retractable,Foldable headphones is suitable for wearing in various places,perfect for school/work/travel/plane.pretty gift for friend/family/teenager/boys/girls/adults. 【Tips】 Please don’t wear headphones at high volume for a long time, because it may damage your hearing. when turn on status,press three time “Play/pause” key to close/open LED colorful lights. power on and under bluetooth mode:consecutively press 2 times “pause/play”key can change the language 【Notice】 Please Charge for 2 hours before you first use！！！
