Casio Black Edifice EX515 Watch

connects to cellphones via Bluetooth to display the time with a split-second accuracy. It also has world time, which lets users select from about 300 places with ease. A speed indicator is indicated by the huge inner dial on the 4 o'clock side. A sign displaying the average speed based on predetermined distances is shown when measuring lap times. Featuring a fully automated LED light that ensures visibility at night by illuminating the dial and liquid crystal display with a simple wrist tilt.