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

These modules are so small

These are Carbon Film Resistor with a value of 680k ohm 1/2W and tolerance of ±5%

High Impedance Buffers

Gold for these 160K resistors

Characteristics: powerful sound

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