These files contain Morse Code practice sounds using the Farnsworth teaching method. Characters are sent at 25 wpm spaced out to speeds of 5 to 25 words per minute (wpm). This way you don't have to relearn the sounds of the letters as you increase your speed, you just shorten the gaps between the letters and words. You don't have to send the letters at 25 wpm, just make sure you keep the same relative timing. A dit is one time element, a dah is three times that, the spacing between letters if the same time as a dah and the space between words is three dah times.