Bluetooth __top__ | Bl12-a3
| Pin | Name | Description | |-----|---------|----------------------------------------| | 1 | VCC | Power input (3.3–5V) | | 2 | GND | Ground | | 3 | TXD | UART transmit (connects to MCU’s RX) | | 4 | RXD | UART receive (connects to MCU’s TX) | | 5 | STATE | Bluetooth connection status (HIGH when connected) | | 6 | EN/KEY | Enable / AT command mode trigger |
Utilizes an upgraded Bluetooth 5.3 protocol, offering significantly better stability and lower latency than older entry-level modules.
To the untrained eye, it was a waste of rubber and silicon—a generic, white plastic dongle, no bigger than a thumbnail, with a bright blue LED that blinked with the rhythm of a nervous heartbeat. It cost $4.99, plus shipping.
BL12-A3-2047 Peer device: UNKNOWN Data exchanged: 1.2 KB Payload content: [ENCRYPTED] bl12-a3 bluetooth
The profile is the default device pairing name and embedded audio module found primarily in smart LED bathroom mirrors, modern illuminated floor mirrors, and multifunctional desktop organizers . Built to deliver convenient wireless audio streaming, this hardware integration allows users to effortlessly cast music, podcasts, or morning news directly from their smartphones or tablets to a built-in speaker system. What is the BL12-A3 Bluetooth System?
| Specification | Details | | :--- | :--- | | | BL12 | | Bluetooth Version | 5.0 | | Wireless Range | ≤ 10 meters (~33 feet) | | Battery Capacity | 2400 mAh lithium-ion battery | | Playback Time | > 10 hours (at moderate volume) | | Dimensions | 410mm × 65mm × 65mm (approx. 16.1" x 2.6" x 2.6") | | Connectivity | Bluetooth 5.0, 3.5mm AUX input, SD card slot | | Design | Sleek black finish, unique cylindrical aesthetic with a volume dial |
In modern "smart homes," the BL12-A3 is the default Bluetooth name for . These units allow users to stream music or podcasts during their morning routine. Users often search for this specific keyword when trying to troubleshoot "ghost" connections from neighbors, as the module remains "discoverable" whenever the mirror is powered. 2. Luxury LED Shower Systems BL12-A3-2047 Peer device: UNKNOWN Data exchanged: 1
Sometimes found in illuminated cabinets or specialty shelving. DIY Audio: Due to its compact size ( ), it is also used in custom hobbyist speaker projects. Bluetooth Speaker - Artforma
If you find a listing for the BL12-A3 on your favorite online marketplace, do not hesitate. Just ensure it mentions and USB-C . For under $30, it is the best insurance policy against boring silence you can buy.
Open the Bluetooth settings on your smartphone or tablet. | Specification | Details | | :--- |
Reliably maintains stable audio feeds within 30 feet (roughly 9-10 meters) in line-of-sight environments without dense barriers.
Elias was a "legacy technician," a fancy title for a man who spent his days in the basement of the city archives, ensuring that the ghosts of the digital age didn't fade into static. He sat before a towering stack of hard drives—some clicking, some whirring, some ominously silent.
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