Retekess Window Speaker,Drive Thru Intercom System,Speak-Thru,Two Way Communication Devices,Dual Way Interphone for Business,School,Office

Window speaker system has volume adjustment; with plastic material;easy to set upFit for drive through window;bank; securities;post office; railway station; ticket window; office;hospitalThe signal can be sent and received at the same time at different directions; and window speaker system can automatic recognize and process the speech signals; so it can provide clear two way sound; less signal statics noiseVolume AdjustmentThere are 2 big knobs for station and speaker volume control separately; also 2 small buttons for mute switch function; also there is a red button to turn off the power; very convenient useEasy to Set UpFull automatic call control technology; and the loudspeaker and mic of secondary machine are upgraded by integration; just plug the power adapter and connect speaker cable with AUX IN jackThe main and secondary speakers output power can reach 3W; that means clear voice and high speech resolutionSupport Recording FunctionThere is Record Out jack to support external recording; very importa...