Our device is capable of generating between 0.1Hz and 200 kHz. Unlike normal sounds, it can generate square as well as sine waves. Square waves are signals that instantaneously shift between two separate levels. For convenience, it has four levels: 100 Hz, 1 kHz, 10 kHz, and 100 kHz. A knob located in the upper right corner precisely controls the frequency. There is also a jack for a 5.5-watt speaker, which is controlled by a dedicated amplitude knob. The entire unit runs on 110 V AC. An included cord allows you to plug the device into a wall outlet.