Serial RS232 TTL HC-05 Wireless Bluetooth Transceiver Module 2 in 1 Specifications: This Bluetooth module is slave and master two in one module This module can be set to a transmitter or receiver, transmitter could pairing with receiver , receiver can pairing with computers and cell phone bluetooth Use the CSR mainstream bluetooth chip, bluetooth V2.0 protocol standards Size：28mm x 15 mm x 2.35mm https://elecena.pl/product/16395946/rs232-wireless-bluetooth-transceiver-hc-05 2020-04-06 https://elecena.pl/product/16395946/rs232-wireless-bluetooth-transceiver-hc-05 2020-09-01 https://elecena.pl/product/16395946/rs232-wireless-bluetooth-transceiver-hc-05 2021-03-02 https://elecena.pl/product/16395946/rs232-wireless-bluetooth-transceiver-hc-05 2025-07-09