Features: Brand new and high quality The E104 wireless module supports both SPP3.0 and BLE4.2 modes, ensuring suitable for various devices for stable data transmission. With its low power design, this compact module extends battery life and provides longer usage time. It can be easily configured and controlled using simple commands. This module caters to manufacturers and developers looking to integrate wireless functionality into their product. It's also suitable for enthusiasts and DIYers interested in wireless experiments and projects. From industrial automation to communication scenarios, this versatile module finds applications in data transmission and control system, enhancing productivity. Whether it's for mobile device accessories or home applications, this wireless module enables seamless communication. Its advanced technology ensures reliable data transmission and prevents interference. Specifications: Material:PCB Size:Approx.13x21mm/0.51x0.82inch Package Includes: 1x Serial Port Module note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.