About this item 【LED Colorful Design】:This Red-Black B39 over ear wireless headphones design with Round loop LED lighting up,Lighting of seven colors,,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. Product description 1.360-degree surround stereo sound quality,enjoy the perfect music experience. 2. LED colorful Blinking design,pretty color lights follow rhythm of music on both sides of headphones.Best work on Gaming/work/school/travel/plane. 3. Comfortable earmuffs for listening,[Warmly remind: please take off the headphone every 1-2 hrs to relax your ears. 4. Adjustable Headband,Foldable design for carrying 5.36 hours long battery 6. Supports TF Card & 3.5mm Audio Cable,when the battery has run out,3.55mm cable can work as wired headphones. 7. Advanced Bluetooth 5.0 Version Specification Drive unit: 40 MM Sensitivity:105 dB±3dB Impedance: 32 Ω±15% Frequency Response: 20 HZ-20 KHZ Bluetooth distance:10m Play time: 36h Standby time: 360h Charging time: 2-3 h (goes out after full charged) Charging port: Micro USB