4 Channel RF Wireless ON/OFF Smart Switch with RF Remote Control 5 metres These modules are so small

These modules are so small

Gold for these 160K resistors

BC847B General Purpose Amplifier Transistor is widely used in transistor based amplifier and switching Applications

which are Orange

It has a 2-wire interface

4 Channel RF Wireless ON/OFF Smart Switch with RF Remote Control 5 metres These modules are so smallA Four channel relay board with a wireless RF interface that can be controlled by a wireless remote. The relays can regulate 250 V 10A appliances, motors, and other electrical circuits, etc. When the remote is in line of sight, the board has a range of 100 meters and roughly 25 meters indoors. This board's RF connection operates at a frequency of 433MHz. Both the transmitter and the receiver have an inbuilt antenna and are easy to use. Receiver