headset (often listed as variants of the A123 or similar sport Bluetooth models) aims to cater to active users, commuters, and those seeking a versatile, cost-effective, over-ear or behind-the-ear audio solution . This article provides a comprehensive look at the BL12A3 Bluetooth headset Go to product viewer dialog for this item.
The BL12A3H module itself is designed with an IP44 water resistance rating . This means it is protected against solid objects larger than 1mm and splashing water from any direction. It is not submersible and should be protected from direct water jets or immersion.
This module is designed with a specific user base in mind:
The headset typically comes with adjustable ear caps to accommodate different ear sizes for a more comfortable fit. 2. Audio Performance and Functionality While categorized as a budget option, the BL12A3 Bluetooth headset Go to product viewer dialog for this item. bl12a3 bluetooth full
Use two BL12A3 modules (master/slave pair) to replace a physical cable between a joystick and a robot controller. The transparent UART mode minimizes latency (< 10 ms typically) for real-time control.
Q: What is the operating temperature range of the BL12A3 module? A: The operating temperature range of the BL12A3 module is -40°C to +85°C.
When searching for users are often looking for one of three things: headset (often listed as variants of the A123
Before pairing or to change module settings, you must enter AT command mode. This is typically done by:
Bluetooth 5.0 (backward compatible with 4.2, 4.0, and lower). Operating Voltage: 3.7V to 5V DC.
| Parameter | Value | | :--- | :--- | | | 3.0 + EDR (Enhanced Data Rate) – backwards compatible with 2.1 | | Frequency Band | 2.4 GHz ISM (79 channels) | | Output Power Class | Class 2 (up to 4 dBm) – range approx. 10-15 meters line-of-sight | | Sensitivity | -82 dBm (typical) | | Core Chipset | Broadcom BCM2042 or BCM20730 (variant dependent) | | Interface | UART (TTL levels, 3.3V), PCM for audio, and GPIO | | Profiles Supported | HSP, HFP 1.5, A2DP 1.2, AVRCP 1.4, SPP | | Operating Voltage | 3.0V – 3.6V (absolute max 3.9V – risk of damage) | | Current Consumption | Active TX: 45-55 mA, Sleep: <1 mA | | Antenna Type | On-board PCB trace antenna or u.FL connector | | Form Factor | 16mm x 20mm x 2.3mm (typical) | This means it is protected against solid objects
Search for "BT-SPEAKER" or similar on your phone. If it won't connect, hold the Mode button to reset the connection.
If you are repairing a vintage Bluetooth speaker or building a wireless serial bridge where audio quality matters more than power consumption, the BL12A3—with its feature set of A2DP, HFP, and SPP—is a robust, proven workhorse.
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, detailing its technical layout, integration use cases, step-by-step pairing instructions, and targeted troubleshooting steps. Key Technical Specifications