Feature: 1. Speaker and Mic: This intercom system features premium speaker and high sensitivity microphone, designed for counter and dual way interworking. 2. Simple Operation: Just connect the power adapter and external speakers to the main station, and there are 2 knobs to adjust the internal and external volume. 3. Pure Sound Quality: Using excellent electro acoustic circuit device, the main and auxiliary machines are both 5W high power output, with clear voice and high resolution. 4. Auto Call Control: Adopt duplex voice intercom communication technology, automatically recognize and process voice signals without other operation. 5. Wide Application: Suitable for places where safety glass is installed, such as banks, ticket offices, hospitals, post offices, embassy visa offices and station window, etc. Specification: Item Type: Dual Way Intercom Material: ABS Colour: Black Output: DC 12V 1000mA Peak Output: 2 x 5W (Maximum) Speaker Impedance: 4Ω Frequency Response: 100Hz-12KHz Scope of Application: Suitable for places where safety glass is installed such as bank window, ticket office, hospital window, post office window, security window, embassy visa office, securities company, station, etc.. Package List: 1 x Host1 x Auxiliary Machine1 x Power Adapter2 x Adhesive2 x Wire Clamps1 x Blowout Cover1 x User Manual