Retevis RT-9908 Dual Way Window Intercom System Bank Counter Interphone Zero-touch For Business StorFeature:Auto dual-way intercommunication without pressing any buttonAnti-interference and noise-free functionDual-way audio record outputThis model is 110 V/220V VoltageAll of our items are brand new.Anti-interference and noise-free functionTwo-way voice intercom communications technology, automatic identification of processing speech signals during a call does not require any actionDedicated anti-side tone processing chip, with auto-mute functionApplication of fully automated call control, outside the machine's microphone and speakers to use the integration of design and front-line system of the host to connect, easy installationComprehensive application of electro-acoustic technology experience, the selection of high performance electro-acoustic circuit design, the output power up to 3W, voice clear and loud voice distinguished high.Inside and outside the two-way voice signal output(recording by the bank teller), a stereo jack output mode can prevent voice recording function controlled by the power switch and the function buttonsApplication: bank, securities, bus station Where guard glass again theft is installeSpecification:Working voltage: AC9V/1AMain sound (sub sound): 3WInside microphone: -48db 20Hz-20KHzOutside microphone: -48db 20Hz-16KHzExterior size: 158 x 87 x 46cm/78 x 20 mmPackage Included:1 x Dual-way counter interphone1 x External speaker1 x Charger1 x English User manual