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 installed

Aluminum alloy shell material
The main unit has aluminum alloy shell; and the extension has built-in speaker;This system has simple connection for DIY operation

Simple operation and install
Adjustable 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 intercom

Feature:
Dual way intercommunication
Slim fit design of speaker
Anti-interruption and noise
Dual way audio record

Specification
Material: aluminum alloy shell
Connection cable length:1.8m
Working voltage: DC12V with 500mA
Adapter: AC 110V 50/60Hz
Main sound (sub sound): 3W+3W
Microphone sensitivity: -48db 20Hz-16KHz

Package Includes
3 x Dual-way counter inter phone
3 x External speaker
3 x Power adapter
3 x English manual