ZDL 9908 Bank/ Office/ Store/ Station Counter Window Intercom System, Dual-Way Intercommunication Microphone, Interphone System

Adjustable Volume with Separate Switch. Spare Record Jack for the Bank Anti-interference and noise-free Function Internal microphone for extension. One-wire Connection Adjustable Volume with Separate Switch. This Product is Used to Talk Between Separated Glass, Walls, Doors and other Objects, So the Host and speakers are best installed on Both sides of the separated Glass and Wall. This Measure Can Effectively Reduce Interference Noise.