Quantity   Component name
1 × HT9290A Holtek HT9290A One key dialer
2 × 22 pF
1 × 2N3904 Discrete Semiconductors / Transistors, MOSFETs, FETs, IGBTs
1 × 3.579535 MHz crystal Crystal
1 × 10µF
1 × 0.1µF
1 × Pushbutton
1 × Speaker 8-16 ohms