1、The built‑in high‑definition class D amplifier has a powerful sound effect, three‑frequency adjustable, (vocal, bass, volume). 2、Built‑in 2000mAh lithium battery, battery life about 8 hours, long‑lasting use. Multiple connection playback methods, wireless Bluetooth, wired USB audio cable. 3、The appearance is made of high‑quality artificial leather fabrics, and the antique combination of bronze and gold. The knob adopts a damping design to make it feel smooth and textured, high‑end and elegant. 4、The speaker adopts a specially‑tuned Class D three‑frequency adjustable power amplifier to make the sound more outstanding, and the human voice is quiet and clear. 5、The bass adopts a guide hole design, the bass sound is steady and powerful, and the 4 speakers enable you to enjoy the music. Item Type: Bluetooth Speaker Material: Metal + Artificial Leather Color: Black Power Speaker: Two 5-watt Class D amplified tweeters Two 10-watt class D amplified woofers Box Structure: Bass reflecting guide hole Maximum Sound Pressure Level: ≥75dB Frequency Response Range: 80Hz-20kHz Bass and Treble Adjustment: Use the speaker knob to adjust Left and Right Two-Channel Stereo: 2.0 Control and Connection Wireless Connection Method: Bluetooth 4.0 Drive Wired Connection: 3.5mm audio interface, USB maximum support 32G, FAT32, support MP3, WAV Top Panel Control: Bluetooth indicator light, power-on indicator light, charging indicator light Knob Control: VOLUME (volume) BASS (bass) TREBLE (treble) Power Supply: Power Frequency: 50-60Hz Battery Properties: Battery Type: Built-in rechargeable lithium battery Battery Capacity: 3x2000mAh (22.2wh) Battery Life Time: About 8 hours Charging Time: Charging from red light to blue light means full charge, charging for about 4 hours The Best Use Angle: The speaker backs to the wall at a distance of 5cm, if the guide hole on the back of the wall is completely attached to the wall, the bass will fail. 1 x Bluetooth Speaker 1 x Audio Cable 1 x Power Cord 1 x Chinese and English Instruction