Trouble ShootingIssue ResolutionNo Sound. Check that the master volume isturned up as well as the volumecontrol for the appropriate inputand/or device.The volume will not change. Check each control knob and turnto desired position.The unit does not power on. The unit may not be charged. Plugthe power supply in.Specifications & FeaturesFunctions Amplifier, NFC, Bluetooth,2 16-channel UHF receivers,XLR/1/4” Mic Input, RCA Aux Input,3.5mm Aux Input, RCA Line Output,Composite RCA Video Outputsfor iPod and DVD Player, Standard1-3/8” tripod mounting holeon the bottomProduct Weight (incl. accessories) 14.6 lbs (6.6 kg)Main SystemPower Adapter 100-240V~50-60Hz switching-typewith DC 18V/3.33A outputWorking Voltage 12-18 V (DC)Max Working Current 5 ABattery Recharge Time < 10 hoursBattery Usage Time > 2 hours (Max Power) **Note:Usage time will depend on programmaterial and battery age. If playing“loud” types of music (pop/rock) atmaximum volume, usage time maybe less (e.g. 1.5 hours).Sensitivity (MIC) 7.4 mVSensitivity (AUX) 190 mVPower Output 30 W (RMS)Speaker 6.5 inch, 4 ohm, full-rangeBattery Capacity 6 AH12