Quantity   Component name
4 × Tactile Switches
1 × SMD SPST Slide Switch
1 × Through-Hole SPDT Slide Switch
1 × 500mAh LiPo Battery
2 × Bone Conduction Transducers
1 × 3D Printed Case
3 × 4-40 1/2" screws
1 × Microchip RN52 Bluetooth Audio Module Microchip's RN52 Bluetooth® audio module provides a fully integrated solution for delivering high-quality stereo audio in a small form factor...It provides a UART interface, GPIO, stereo speaker outputs, stereo microphone inputs, and a USB port.
1 × BLK-MD-SPK-B (First Prototype's Bluetooth Audio Module) A cheap BT audio module from china. Proved the concept in the first prototype, but the final design is in need of an upgrade to the RN52.
1 × Adafruit Stereo 2.8W Class D Audio Amplifier - TS2012
1 × Adafruit PowerBoost 500 Charger - Rechargeable 5V Lipo USB Boost @ 500mA+
1 × 3mm Red LED
1 × 3mm Blue LED
1 × 47Ω 0603 Resistor
1 × 1.13MΩ 0603 Resistor