Ⅰ. Key features: • Sound and design: Wireless headphones, suitable for listening to music while exercising, traveling or for everyday use. • RGB lighting: Light rings on the sides that slowly change colors. • Versatility: Wireless and wired use options with a miniJack connector. • Long operating time: • Continuous playback up to 6 hours. • Standby mode up to 15 hours. • Charging in just 2 hours. Ⅱ. Specifications: • Bluetooth technology: • Version 5.0 + EDR, ensuring a stable connection. • Communication range up to 10 meters. • Other connections: • MicroUSB for charging. • MicroSD card reader. • Microphone with noise reduction: • Clear sound during conversations. • Battery: • Built-in rechargeable battery. Ⅲ. Comfort and design: • Adjustable headband: Adapts to different head sizes. • Soft ear cushions: Made of eco-leather, ensuring comfort and sound insulation. • Lightweight construction: Weighs only 170 g, suitable for traveling. Ⅳ. Additional features: • Integrated MP3 player: Ability to listen to music directly from an SD card. • Control buttons: Control the volume, switch songs or answer calls. Ⅴ. Dimensions: • Width: 20 cm • Height: 18.5 cm • Depth: 9 cm • Folded: 18.5 x 12 cm • Weight: 170 g Ⅵ. Package contents: • Wireless headphones B39 • USB charging cable • User manual