Speaker Type: Bluetooth Speaker Color: Brown and Black Speaker Box: Wooden Panel: Net Volume Adjustment: Rotary knob Power Supply: Battery Battery Capacity: 4500 mAh Rated power: 16W (8W x 2) Speaker: 3 inches x 2 Frequency Range: 40Hz-20KHz Interface Type: USB Connection: Bluetooth 4.2 / AUX (3.5mm) audio input / TF card / U disk Signal to noise Ratio: >=75dB Functions: - Wireless Bluetooth 4.2 connection - TF card playback - AUX wired connection - Voice prompt function - U disk playback - Payment voice broadcast Features: - Portable high power Bluetooth audio, leather appearance with wooden box: Box is made from high-density synthetic fiber wood, the exterior layer is of wear-resistant leather, durable enough. - Non-slip foot pad: Intimate anti-slip foot pad design, wear-resistant, stable and safe to place. - Two colors optional, brown and black. Retro design with woven style of net, elegant too. - Portable handheld design: Leather handle with metal CD print trim, comfortable when carried and also it is removable. - Suitable for different occasions, indoor or outdoor, it can be used by suburban camping, dancing, yoga, etc. - Dual stereo speakers, sound is excellence: Full frequency dual speakers with left and right channels, unique wooden resonance box, high power to experience an immersive pure sound. - Dual knobs design, easy to control: Just rotating to adjust the volume and cut songs, it is very convenient. - Multiple playback modes: Support Bluetooth 4.2, TF card, U disk, AUX playback, to meet personalized needs; Bluetooth connection is stable (10 meters away) and intelligent to reduce noise. - Long-lasting battery life: Built-in 4500 mAh high capacity lithium battery, low energy consumption and stable performance; 2-4 hours on charging, 4-8 hours on playback. - Smart and Compatible: Compatible with Windows / Android and other operating systems; Easy connection to mobile phone /computer / tablet and other devices, as well as all kinds of music playback soft like watching movies, listening to music, voice chat, playing games and etc. Key Instructions Knob 1: - long press: On/Off - Short press: Pause/Play; Turn clockwise to increase volume and turn counterclockwise to decrease. Knob 2: - Function switch button. - Short press: Mode Switch (Bluetooth/TF/USB/INPUT mode) - Turn clockwise to play the next song and turn counterclockwise to play the last.