In the 1980s, the ultrasonic devices of the 2 Way Remote Control Light Switch were gradually replaced when the semiconductor devices for sending and receiving infrared rays were developed. Even though other wireless transmission methods (such as Bluetooth) have been continuously developed, this technology has been widely used until now.
The 2 Way Remote Control Light Switch can control 2 lights group.
The 2 Way Remote Control Light Switch has the beautiful outlook.
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