Retekess Tw102 Window Intercom,Intercom System,8M Microphone,Connect Wireless Mic,Speaker For School,Hospital,Express(3 Pack)

Window Speaker System Is Deal For Bank; Stock-Exchange; Post Office; Railway Station; Cashier Desk; Ticket Office And Hospital; Bus Station; Where Guard Glass Again Theft Is Installedaluminum Alloy Shell Materialthe Main Unit Has Aluminum Alloy Shell; And The Extension Has Built-In Speaker;This System Has Simple Connection For Diy Operationsimple Operation And Installadjustable Volume With Separate Switch:Two Knobs To Adjust The Inside And Outside Volume; When The Indicating Lamp For Audio Turns Green;The Inter Communication Could Begin; Spare Record Jack For The Bank:You Could Record The Voice Through Record Jack; The Round Speaker Can Be Mounted Outside So Any Holes Would Just Be To Run The Wire;So Not Need To Make A Hole In The Glass To Install The Intercomfeature:Dual Way Intercommunicationslim Fit Design Of Speakerdual Way Audio Recordspecificationmaterial: Aluminum Alloy Shellconnection Cable Length:1.8Mworking Voltage: Dc12V With 500Maadapter: Ac 110V 50/60Hzmain Sound (Sub Sound): 3W+3Wmicrophone Sensitivity: -48Db 20Hz-16Khzpackage Includes3 X Dual-Way Counter Inter Phone 3 X External Speaker3 X Power Adapter3 X English Manual