Digital watches have many extra functions, which range from more common features such as a timer (chronograph), day/date display, and backlight to more specific features, including a barometer, altimeter and alarm function. A typical customer buying a digital watch is often a fashion conscious person, but may also be seeking the extra features that a classic wristwatch lacks. Some digital watches are made for particularly tough conditions. Casio G-Shock is popular among the military. Even though the market for retro analogue watches has been revived since the late 1990s, digital watches are still as popular as ever.