Recently, because of the COVID-19, many businesses are using the window speaker to increase the communication and keep social distance.
In addition, the window system can increase the effeciency between the customers and staffs. So it is really a good product to buy.
You need to use the headphone like the one use on the PC with 2 jacks, one is microphone and one is headphone. For the speaker one you should plug in the mic port, for the headphone one, you should put in the rec ports.
But pay attention, if you want to use the outside speaker, you can only plug the headphone jack will work. If you want to use the headphone only, you can turn off the buildin speaker inside, so you can only hear from the headphone not outside voice.
And of course, they support the wireless speaker mic, if you need to speak and go around, you can use the TW105 and TW106 intercom system.
TW105 and TW106 two way communication system are new models, the quality is very good. If you want to know more about them, please check
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