Quantity   Component name
1 × Custom circuit board Custom PCB with ATMEGA328P microcontroller, audio preamp circuit and USB-C charging port
1 × Lipo battery 100mAh Tiny lithium-polimer battery to power the circuit, capacity should be 100mAh or greater
1 × NRF24L01 SMD module NRF24L01 radio module (mini surface mount version)