Integrated Bluetooth Technology: Utilize advanced Bluetooth modules , designed for seamless wireless communication. These modules can operate either in master or slave mode, making them versatile for various -based applications Wide Compatibility: Perfect for hobbyists and professionals alike, these modules are compatible with a range of for boards and setups, ensuring easy integration into your existing projects Robust Serial Communication: Facilitate reliable serial communication for your devices, ideal for DIY electronics and robotics projects, enhancing connectivity and control Due to different batches, there may be differences in product appearance and printed text, which not affect use Color:As Shown Material:PCB Package Contents: 5 * Bluetooth Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.