Most digital watches have four standard buttons: Mode, Set/Reset, Start/Stop, and Light. Mode button cycles through functions like stopwatch, alarm, and time. Set/Reset confirms settings and resets functions. Start/Stop controls timekeeping and moves numbers up/down. Light button illuminates screen for better reading
Casio World Time Watch offers four displays for $30. Calculator Watch features 16-button interface for $30. F-91W (plastic version) worn by US Presidents and terrorists
Launched in 2019, quickly became classic alongside DW-5600 and GA-110. Features octagonal bezel and band inspired by DW-5000. Nicknamed "CasiOak" by fans
Released in 1988 as successor to CA-50, featuring resin case and polyurethane strap. Measures 43.2x34.4x8.2mm with 24g weight and 42mm lug-to-lug width. Includes 8-digit calculator, 24-hour stopwatch, and basic water resistance
Founded in 1983 by Ernst Thomke, Elmar Mock, and Jacques Müller. Created as response to 1970s-1980s quartz crisis. Name means "second watch" for low-cost, high-tech casual accessories. First collection launched in Zürich with prices from CHF 39.90
TM1637 is a 4-digit 7-segment LED display with TM1637 LED driver IC. Module requires only 4 wires: 2 power and 2 control pins. Operates between 3.3V to 5V with 80mA current consumption