Audio Bluetooth Receiver Built-in For Streaming From Smart Devices. Double 10 Section Equalizer Regulation. 3 XLR Front 2- 1/4 Microphone Inputs. 2 XLR Rear 2-1/4 Microphone Inputs. Optical / Coaxial Inputs. Built-in MP3 Player Module with USB Jack. Recording to USB Flash Drive (not included). 2 HDMI Inputs with ARC to connect to smart TVs, 1 HDMI Output. 2 Audio/Video Inputs: DVD/VOD. 1 RCA Audio/Video Output. Sound Effect Input/ Output. Banana Plug Speaker Connectors. Speak-on Plug Speaker Connectors. Echo: Low, Mid, High, Repeat, Delay, Volume Controls. Music : Low, Mid, High, Balance, Volume Controls. Microphone: Echo, Balance, Low, Mid, High, Volume Controls for Individual microphones. Voltage: AC 115V – 230V Manual Select. Power Outlet: 110W AC P. Dimensions: 17(W) x 7.5(H) x 16(D). Music Input Sensitivity: 15mV. External Devices Sensitivity : 250mV. Frequency Band : 25Hz? 20kHz. Mic Tone Adjustment: 80Hz +/- 15dB 3.5Hz +/- 8dB 12Hz +/- 15dB. Echo Tone Adjustment: 80Hz +/- 15dB 12Hz +/- 15dB.