BT578 Serial Bluetooth adapter connects to a serial device via DB9 serial port and communicates with a mobile phone or computer via Bluetooth SPP or BLE, establishing a wireless link between the serial device and the computer or mobile phone. It replaces conventional RS232 serial cables, enabling wireless communication and providing greater flexibility and convenience. Bluetooth dual mode: Supports Classic Bluetooth Serial Port Profile (SPP) and Bluetooth Low Energy (BLE). Connects to a computer or Android phone via SPP, or to Android or iOS phones via BLE. Lower power consumption compared to BT578_V2, with extended communication range. Features a widely used USB Type-C interface for power supply and charging. Compatible with both female and male serial port devices using a DB9 connector or converter. A green LED indicates TX/RX activity of RS232 serial communication. Supports Pin 9 power supply: connect Pin 9 to 4–6 V and Pin 5 to GND. Built-in rechargeable battery with over 24 hours of operating time. Supports AT command configuration on a computer to customize device name, baud rate, and other parameters. Specifications: Bluetooth Standard: Bluetooth v3.0 (SPP) + Bluetooth v4.2 (BLE) Selectable Serial Baud Rates: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 bps Serial Communication BLE Characteristic UUID: 0000ffe1-0000-1000-8000-00805f9b34fb Typical Bluetooth Range: 30 meters (line of sight) TX Power: 5 dBm RX Sensitivity: -95 dBm Typical Operating Current: 8 mA Dimensions and Weight: 78 × 34 × 16 mm, 30 g Material: Plastic Color: As shown Package Includes: 1 × Bluetooth module Note: Lighting conditions and display settings may cause slight color variation between the image and the actual product. Measurement tolerance: ±1–3 cm.