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Yes, Bluetooth system, I installed a set of bathroom in my house, and the brand ceilings are sold, I chose Tuscan ceilings at the time, and the whole was good.
Many hospital bedside intercom systems are wired, and wireless ones have never been seen.
Low-fee way:
Buy a few cans of Coke, drink it, and then use an electric drill to drill a hole in the center of the bottom, and then find a way to remove the top, and then cut off a third of the area of the can, from the top to the bottom... Make a signal reflector and aim the notch where you want to increase the signal. >>>More
Of course, you can, but the wireless signal is not too bad.
There are many such buttons on Tmall, and it is recommended to use the button of the mouthy cat brand, wireless FM technology, and the distance is long.
Yes, both routers can be bridged or relayed.