---
product_id: 271151664
title: "Relkin HC-05 Wireless Bluetooth 6 Pin Wireless Serial Port Communication BT Module RF Bluetooth Module 6 Pin for Arduino Uno r3"
brand: "brand: relkin"
price: "HK$92"
currency: HKD
in_stock: false
url: https://www.desertcart.hk/products/271151664-relkin-hc-05-wireless-bluetooth-6-pin-wireless-serial-port
store_origin: HK
region: Hong Kong
---

# Relkin HC-05 Wireless Bluetooth 6 Pin Wireless Serial Port Communication BT Module RF Bluetooth Module 6 Pin for Arduino Uno r3

**Brand:** brand: relkin
**Price:** HK$92
**Availability:** ❌ Out of Stock

## Quick Answers

- **What is this?** Relkin HC-05 Wireless Bluetooth 6 Pin Wireless Serial Port Communication BT Module RF Bluetooth Module 6 Pin for Arduino Uno r3 by brand: relkin
- **How much does it cost?** HK$92 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/271151664-relkin-hc-05-wireless-bluetooth-6-pin-wireless-serial-port)

## Best For

- brand: relkin enthusiasts

## Why This Product

- Trusted brand: relkin brand quality
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## Description

HC-05 Wireless Bluetooth Module:  1.PCB Size: 37.3mm *15.5mm,Weight About: 3.5g 2.Input voltage: 3.6V--6V, prohibit exceeding 7V,With transparent heat shrink tube,dustproof and anti-statics. 3.Leads 6 PIN : EN/VCC/GND/RXD/TXD/STATE (Bluetooth state leads, not connected output low level, the output high level after connection) 4. With the connection status indicator, LED flash indicates no Bluetooth connection; Led slow flash indicates enter at command mode 5. On-board 3.3V voltage regulator chip, input voltage DC 3.6V-6V; When not paired, current about 30mA (due to LED lights flashing, current in the state of change); After the pairing succeeds, the current is about 10mA 6. Effective transmission distance of 10 meters in open area, more than 10 meters is possible, but not to ensure the quality of the connection 7. After pairing succeeds, can be used as full duplex serial port. No need to understand any Bluetooth protocol, but only support 8-bit data bits, 1-bit stop bits, no parity communication format. This is also the most commonly used communication format, does not support other formats! 8. Press the key and then power up the Bluetooth module to enter at mode, set parameters and query information 9. Can switch host and machine mode from at command 10. The module default baud rate is 9600, the default pairing password is 1234, the default name is HC-05  Wiring method: VCC: Connect the power supply positive GND: Connecting the cathode RXD: The receiver, the Bluetooth module receives data from other devices, and the sending end TXD of the other devices normally TXD: Send end, Bluetooth module sends data to other equipment; the receiving end RXD of the other equipments normally En: To enable the end, need to enter the at mode when 3.3V  Package:  2pcs * HC-05 Wireless Bluetooth Module

## Features

- LED Working status indicator - Fast flashing LED means no Bluetooth connection, slow flashing means entering AT mode, double flashing means Bluetooth is connected and the port is opened.
- 2in1 hc-05 Master-slave integration, The original chip corresponds to the master-slave integration function. Master-slave integration can switch between master and slave modes. you can select master mode or slave mode by AT command setting.
- Bluetooth chip use CSR BC417,Comply with Bluetooth V2.0 SPP protocol standard. Support a wide range of baud rate (4800~1382400), the default baud rate is 9600.default pairing password:1234
- Easy to use ,Press the button and power on the module to enter the AT mode. All functions are set by AT commands.
- The input voltage must not exceed 7V and not connect the power supply to the signal pin, otherwise the module will be directly damaged.

## Images

![Relkin HC-05 Wireless Bluetooth 6 Pin Wireless Serial Port Communication BT Module RF Bluetooth Module 6 Pin for Arduino Uno r3 - Image 1](https://images-na.ssl-images-amazon.com/images/I/61u-eU1rLKL.jpg)
![Relkin HC-05 Wireless Bluetooth 6 Pin Wireless Serial Port Communication BT Module RF Bluetooth Module 6 Pin for Arduino Uno r3 - Image 2](https://images-na.ssl-images-amazon.com/images/I/613I0yrHXkL.jpg)
![Relkin HC-05 Wireless Bluetooth 6 Pin Wireless Serial Port Communication BT Module RF Bluetooth Module 6 Pin for Arduino Uno r3 - Image 3](https://images-na.ssl-images-amazon.com/images/I/617WE%2BO7ZwL.jpg)
![Relkin HC-05 Wireless Bluetooth 6 Pin Wireless Serial Port Communication BT Module RF Bluetooth Module 6 Pin for Arduino Uno r3 - Image 4](https://images-na.ssl-images-amazon.com/images/I/61kOIkkNsfL.jpg)
![Relkin HC-05 Wireless Bluetooth 6 Pin Wireless Serial Port Communication BT Module RF Bluetooth Module 6 Pin for Arduino Uno r3 - Image 5](https://images-na.ssl-images-amazon.com/images/I/61VPGJM3URL.jpg)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-03-12*