Vehicle horn horn. Bicycles often have a classic "bulb horn", operated by squeezing a rubber bulb attached to a metal horn. Squeezing the bulb forces air through a steel reed located in the throat of the horn, making it vibrate, producing a single note. The flaring horn matches the acoustic impedance of the reed to the open air, radiating the sound waves efficiently, making the sound louder. Other types of horns used on bicycles include battery-operated horns (sometimes even car horns on 12-volt circuits are incorporated) and small air horns powered by a small can of compressed gas. Oliver Lucas of Birmingham,
Sound the Alarm (Saves the Day album) trilogy with the theme of self-discovery. It was followed by "Under the Boards" (2007) and "Daybreak" (2011). Conley said that "Sound the Alarm" was "an expression of discontent. "Under the Boards" is reflection and remorse. "Daybreak" is acceptance." All the album's songs were written by the band, with Conley providing lyrics. According to Conley, "Sound the Alarm" details the "furious truth of my aching heart, my tumultuous emotional landscape, and my fractured psyche. Knowing that I needed to turn myself around after nearly destroying myself and my relationships with my strained emotional existence". Describing the album's theme, Conley said it