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We are proud that Beemong currently serves well-known importers, large STEM brands, large import retail giants, large training institutions, and government bidding projects in customer countries, and they have always maintained long-term and in-depth cooperation with us (95 % of our customers have continued to cooperate with us since their first order).

In 10 years of experience, we have had too many unforgettable stories with each of our customers. We have continued to work together on each order, and have also continued to enhance our relationship, slowly reaching a deep understanding.

Thanks to our customers’ absolute trust in us, our products have evolved from standard products from well-known brands such as Arduino, Raspberry Pi, Micro:bit, Makey Makey, etc. to gradually customized and personalized products. Product categories have also gradually expanded from DIY electronic products to CNC, 3D printing, drones, chips and other electronic products.

Looking back on the past, our winning advantage lies not in the lowest price, but in doing business in a down-to-earth manner and being a sincere person. We never deceive customers and sincerely cooperate with customers to solve every problem they encounter. We always adhere to one of the most important principles: allowing customers to find a real sense of security in cross-border procurement!

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Email :marketing@beemong.com(for inquiries) info@beemong.com(for technical issues)

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Description

Product Description

The Original HC-04S is a professional-grade, high-performance Bluetooth 2.0+EDR (Enhanced Data Rate) serial module specifically optimized for Industrial Slave-only operation. While standard modules prioritize versatility, the HC-04S is engineered for maximum stability and reduced latency in serial data pass-through applications.

As an “Original” series module, it features an authentic chipset that ensures strict adherence to frequency standards, resulting in a cleaner signal and fewer dropped packets in environments with heavy 2.4GHz interference. The HC-04S acts as a transparent wireless bridge: once a Master device (like a smartphone or PC) connects to it, the module simply passes TTL serial data back and forth as if there were a physical cable. It is the ideal choice for developers who need a reliable, “plug-and-play” wireless interface for high-uptime systems.

Key Features

Optimized Slave Operation: Pre-configured as a dedicated Slave device for instant discovery and high-speed pairing with Android, Windows, and Linux Masters.
Original Industrial Chipset: Superior frequency stability and thermal resistance compared to generic clones, ensuring consistent performance from -25°C to +75°C.
Transparent Pass-Through: No complex Bluetooth stack programming is required; simply use standard Serial.print() commands from your microcontroller.
Wide Power Input: The 6-pin breakout board includes an onboard 3.3V LDO regulator, allowing it to be safely powered by any 3.6V to 6.0V DC source.
Low Latency & High Throughput: Refined firmware reduces the “handshake” time between packets, making it suitable for real-time control and high-frequency sensor logging.
Status LED Diagnostics: Features a bright onboard LED that provides immediate feedback: rapid flashing (Searching), steady/slow-double flash (Connected).

Additional information

Bluetooth Protocol	Bluetooth V2.0 + EDR (Classic)
Operating Voltage	3.6V – 6.0V DC
Operating Current	~35mA (Pairing); < 10mA (Connected)
Logic Level (I/O)	3.3V TTL (VCC is 5V compatible)
Communication Interface	UART (Universal Asynchronous Receiver/Transmitter)
Default Baud Rate	9600 bps
Default Pairing PIN	1234
Frequency Band	2.4GHz ISM Band
Transmission Range	~10 Meters (Class 2)
Modulation	GFSK (Gaussian Frequency Shift Keying)