The main function of this product is to replace the traditional serial communication cable and convert the wired serial connection into a wireless Bluetooth connection, enabling wireless serial communication. It can connect to various devices with standard RS232 serial ports via the DB9 interface and wirelessly communicate with Bluetooth-enabled master devices such as smartphones, tablets, desktop computers, notebook computers, and BT580 hosts that support Bluetooth BLE functionality. Utilizing widely adopted Bluetooth BLE technology, the Bluetooth master device achieves serial communication with the serial device connected to the BT580 by monitoring and writing the Bluetooth characteristic values within the BT580. Color: Grey Material: Plastic Package Contents: 1 x RS232 Bluetooth Adapter 1 x USB Cable Note: The package includes only the items listed above; other products are not included. Note: Lighting effects and different display settings may cause slight variations in the color of the item as shown in the image compared to the actual product. Measurement error allowance is +/- 1-3 cm.