Speaker Edifier R1380DB Black

All wooden enclosure minimizes acoustic resonance
1-inch(25mm) tweeter and 4-inch(116mm) mid-bass driver
Class-D amplifier with 42W RMS total power output
TI PCM9211 digital decoding chip for precise audio processing
Versatile connectivity: Optical, Coaxial, Line In, and Bluetooth inputs
Bluetooth V5.1 with Qualcomm® aptX™
Side panel controls and remote control for easy oper 

Bluetooth version V5.1
Audio codecs APTX, SBC
Power output (RMS) 21W+21W
Frequency response 55Hz-20KHz
Audio inputs Optical, Coaxial, Line In, Bluetooth
Input sensitivity
Line In1: 450±50mV Line In2: 550±50mV
Optical/Coaxial: 450±50mFFs
Bluetooth: 700±50mFFs
Signal-noise ratio 85dB(A)
Noise level 35dB(A)