Calltou Window Speaker Intercom System – Dual-Way Anti-Interference Microphone & Speaker for Bank, Office, Business, Hospital Color:1 PACK This means you can communicate

This means you can communicate freely without worrying about connectivity issues or additional charges

equipment in your home or those of your neighbors

【Multi-use for one machine】 Built-in double high-power speaker

Double Loudspeaker

Press the volume control and hold it until hear a sound "ding-dong"

Calltou Window Speaker Intercom System – Dual-Way Anti-Interference Microphone & Speaker for Bank, Office, Business, Hospital Color:1 PACK This means you can communicateProduct Description Voice Communication Dual way intercommunicationThe Window speaker intercom system adopts auto dual way intercommunication technology,automatic indentification of processing speech signals during a call dose not require any action Knob Voice AdjustmentBank window intercom system has the ability to adjust the volume on the both sides; And knob design can be more convenient to operate; Less static noise or hollow sounding High