Quantity   Component name
20 × ATTiny2313 Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
21 × JDY-40 cheap radio module
20 × AMC7135 Power Management ICs / Linear Voltage Regulators and LDOs
20 × LEDs Electronic Components / Misc. Electronic Components
20 × ZTT12 Frequency Control / Resonators
20 × TP4056 Lithium charge controller
21 × 18650 lithium batteries Electronic Components / Misc. Electronic Components
1 × ESP8266 Microcontroller