Was never used outside of my home. The KJV-835 is the hottest product from Acesonic! The world’s first karaoke mixing amplifier with a built-in 3.5 LCD display and MP3+G playback and WAV recorder. The Acesonic Professional Rack-mountable KJV-835 400-Watt Mixing Amplifier is designed with KJs and serious karaoke singers in mind. It’s patented design will forever change how you will be using your karaoke mixing amplifiers in the future. Starting from its unique: built-in dual A/V outputs switches with a 3.5 LCD monitor. The first A/V switch is to set the output for the singer’s monitor and the second A/V switch is to set the output of the built-in LCD monitor and the headphone jack. The key of the design is the 2nd A/V switch that makes the amplifier unique. In the old days, it was impossible to cue the next song from a 2nd A/V source when you only have 1 input source which the singer is using. Now with the 2nd A/V output to LCD screen, you can either monitor what the singer is seeing or you can get the next song ready in the background while the singer is performing. You can seamlessly play your gigs continuously without any downtime for switching music track. Alternatively, if you don’t have a TV ready when you are performing, you can just use the 3.5 LCD monitor to see your karaoke tracks. The second unique design of this amplifier is its built-in WAV recorder and player module. Now you can digitally record all of your performances using the Acesonic KJV-835 Mixing Amplifier. Whether you are singing, speaking or playing instruments, you can record your performances to the SD card and forever preserve your best performance for you or your singers. You can play the recorded WAV tracks on your PC or on the amplifier, or post it online! You can even convert the WAV to MP3. The MP3+G module also plays MP3+G files stored in SD Cards. You can take your downloaded or converted MP3+G karaoke tracks and play them on the KJV-835 mixing amplifier. When you record your singing while playing MP3+G tracks, it will not only record the audio track but also record the graphic track at the same time. When you playback your recorded performance, you will see if your singing is following with the lyrics on the screen. Another world’s first invention! Finally, the KJV-835 Mixing Amplifier has a built-in USB port. You can play your music and record your performance digitally from and to your PC or Mac. You can turn your laptop into a karaoke player and connect it to the mixing amplifier for audio output. Not only it will play the music from your laptop, it will send the performance back to the PC using the USB port. You can instantly capture the audio signal in either MP3 or WAV format and share with your friends. 400 Watts Max Power Output. 3.5 Built-In LCD Screen to monitor a 2nd A/V source. Headphone Output for 2nd A/V source. LCD Status Screen to Display: Key, Main Input Source, Monitor Input Source and Multiplex. Built-in MP3G Player Module. Records your singing to WAV. 4 Audio/Video Inputs: DVD/AUX/PC/MP3G Module. 2 Component Video Inputs: DVD/AUX and 1 Component Video Output. 1 RCA Audio/Video Output. 1 PC Input (Composite Video + USB Port). L/R Multiplex Channel Output Selector. Music Low, Mid, High, Balance, Volume Controls. Microphone Delay, Repeat, Echo, Low, High Volume Controls. Microphone Volume Controls for Low, Mid, High, Echo, Balance, Volume for individual microphones. 3 Front & 2 Rear 1/4 Microphone Inputs. 4 Audio Outputs Record Out, Line Out, Subwoofer Out (Music/ Mixing), Mic Out (High/Low). 2 Banana Plug Speaker Connectors. 115/230 Voltage for Worldwide Compatible. Built-in BBE Sonic Maximizer for both vocal and music. Temperature-Active, Ultra-Low-Noise Fan for non-stop operation. 2 SpeakOn Speaker Connectors. Pre-Input and Pre-Output for External Effort. 100W AC Power Outlet. Integrated USB Audio Solution using C-Media CM106 Audio I/O Controller works for PC and Mac. 200W + 200W RMS (8 ohms). 300W + 300W RMS (4 ohms). Total Harmonic Distortion:? 0.5%. Input Sensitivity:? 250mv. Max Input Signal: 2.5Vp-p. Signal to Noise:? 80dB. Mic Treble Adjustment: ±10dB. Mic Mid Adjustment: ±8dB. Mic Bass Adjustment: : ±10dB. Key Control Range +/- 6 Half Tones. Frequency Response: 20Hz-20KHz (±3dB). Microphone Input Sensitivity:? 25mV. Echo Delay:? 200ms. Speaker Wattage Impedance: 4 Ohm – 8 Ohm. Voltage: AC 115V – 230V Manual Select. Dimensions: 17″(W) x 6.5″(H) x 14(D).