| Component | Model / Specification | Role | Est. Cost |
|---|---|---|---|
| Microcontroller | ESP32-C3 SuperMini (RISC-V) | Main Logic & Audio Storage | $2.10 |
| Power Supply | 18650 Battery Shield V3 (Always-On) | Uninterruptible Power (UPS) | $2.50 |
| Amplifier | MAX98357A I2S Class D | Digital Audio Decoding | $1.60 |
| Speaker | 4Ω / 8Ω 3W Cavity Speaker | Audio Output | $2.00 |
| Passive Parts | 1x 470µF Capacitor, 2x 10kΩ Resistors | Power Smoothing & Sensing | $0.25 |
| TOTAL | ~$8.45 |