The new Kisai Keisan watch uses a unique rippled convex lens that magnifies the lighting effect from the LEDs behind the numbers in the watch face. As is often the case with Tokyoflash watches, you might need to take a minute to sort out what time it is.

To figure out the time or date on their latest creation, just add the digits in each of the four vertical lines of numbers. Now if only it included a calculator to help you tell time – that would be something.

Each Keisan watch is crafted from a gorgeous aluminum body and comes in silver (with orange or yellow leds), or black (with red or green LEDs).

They retail for ¥23,900 (appx. $255 USD) including worldwide shipping, and are available now over at the Tokyoflash website.

Perfect for heavy duty spreadsheet users, this nifty new application for the iPhone and iPod Touch lets you use your mobile device as an ad-hoc numeric keypad for your Mac. Just install Balmuda’s Numberkey connect software onto your Mac, then grab the mobile app from the App Store for $1.99. The two pieces of software communicate via Wi-Fi, adding a familiar 18-key numeric keyboard to your Mac without wires.

Numberkey includes four different skins, including black on white, white on black, old school Mac and a recently added black on silver for new MacBook Pro users. While the lack of tactile feedback might slow you down a little bit, I still think it’s still convenient to have the extra keys.

At this point, Numberkey is a Mac only app, so Windows users need not apply. Now if they could only figure out how to fit the whole MacBook inside the iPhone, I’d be set.