Features: 【Portable Design】 double paddle automatic key metal, for outdoor enthusiasts. Its 4.98x3.2x2cm size fits easily into backpacks for hiking or camping trips while maintaining durability in harsh environments. 【Precision Telegraphy】Delivers stable shortwave radio transmission with accuracy. Solve traditional signals instability issues in complex terrains, for emergencies communications and amateur radio operators' daily operations. 【Broad Compatibility】Seamlessly connects with various development boards and supports multiple frequency ranges. for electronics engineers and developers working on projects, eliminating compatibility concerns while enhancing workflow efficiency. 【Toolless Assembly】Features quick installs structure requiring not tools for setup or disassembly. Saves time for users who frequently relocate equipment, especially useful for outdoor event organizers and emergencies response teams. 【Metal Construction】metal build offer superior wear resistance and corrosions protections. Outperforms plastic materials for long use, particularly in humid or extreme weather conditions, ensuring performances when you need it most. Specifications: Materials: Metal Size: 4.98x3.2x2cm Package Includes: 1PC Portable Scull Automatic Key note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.