4PCS HC-05 Wireless Bluetooth RF Transceiver Master Slave Integrated Bluetooth Module 6 Pin Wireless Serial Port Communication WL BT Module (HC-05)

Diitao 4PCS Bluetooth Module BT Modules 6 Pin Wireless RF Transceiver Long Range Bluetooth Transceiver for Arduino (HC-05)

Nano V3.0, Nano Board ATmega328P 5V 16M Micro-Controller Board Compatible with Arduino IDE (Nano x 3 with USB Cable)

ELEGOO UNO R3 Board ATmega328P with USB Cable(Arduino-Compatible) for Arduino