Quantity   Component name
1 × HT12E Encoder IC https://www.utsource.net/itm/p/118797.html
1 × HT12D Decoder IC https://www.utsource.net/itm/p/1014623.html
1 × RF 433 MHZ https://www.utsource.net/itm/p/8672838.html
1 × 4 push buttons
1 × Hearders (male or female it doesn't care)
1 × 4 resistors with a value from (100 to 330) ohms
1 × 4 leds any color 3mm of diameter (miniature)
1 × 1 Megaohm resistor for IC of the transmitter (IMPORTANT)
1 × a 68K or very very neraly resistor value for the receptor (IMPORTANT)