Morse straight keys are manual telegraph keys used to transmit Morse code messages. They consist of a lever or paddle that is pressed down to complete an electrical circuit, allowing the transmission of a specific Morse code character. Morse straight keys are commonly used by amateur radio operators and telegraph enthusiasts. They are known for their simplicity and reliability, making them a popular choice for Morse code communication. Morse straight keys can be made from various materials, including brass, steel, and plastic. They come in different sizes and designs, but they all serve the same purpose of allowing the operator to send Morse code signals.