Quantity   Component name
1 × Landline telephone With keypad matrix
1 × Raspberry Pi Pico Or Raspberry Pi Pico W
1 × DFPlayer mini (or MP3-TF-16P clone) MH2024K-24K, MH2024K-16SS and many more chips are supported
1 × MicroSD card 8GB or more is recommended
1 × TP4056 battery charger module
1 × 18650 or equivalent lithium battery
1 × 1000uF electrolytic capacitor
2 × 1K resistor
1 × 3.5" audio socket