Speaker Edifier R1580MB

Active bookshelf speaker system with 42W total power output
Dual microphone inputs for use as public address system
Bass, treble and master volume controls located on the side panel
Class D amplifier with 4inch bass drivers and 19mm silk dome tweeters
Wireless remote control with mute and volume adjustment
100% MDF wooden enclosure to minimize acoustic resonance
Universal 100V-240V power supply 

Power Output : R/L: 21W + 21W RMS
Noise level : 25dB(A)
Frequency response : 55Hz~20KHz
Microphone
dynamic range : -50~30dBV
Input sensitivity : PC: 700±50mV
AUX: 550±50mV
Bluetooth: 550±50mFFs
Input type : 1/4”, AUX, PC, Bluetooth
Midrange & bass unit : 4 inch (116mm)
Treble unit : 1/2 inch (13mm)
Bluetooth version : V4.0, A2DP and AVRCP protocol