Quantity   Component name
1 × Adafruit ItsyBitsy nRF52840 Express https://www.adafruit.com/product/4481
2 × 1/4 TRS (Stereo) female connector
1 × Optional active high buzzer module
1 × Hammond Manufacturing 1593VBK Enclosure
1 × 7805 regulator
1 × DC power plug
1 × 1N4007 diode
1 × 0.22uF capacitor
1 × 0.1uF capacitor
1 × prototype board