littleBits Individual Bits - USB Power
Price in Singapore Dollars, including 7% GST of $1.05
The USB power is probably the smallest, but it charges up your creations fast. Connect a USB cable (included) to your computer or phone charger to charge your creation. Try it with an LED to make the simplest littleBits circuit. If you're looking for a permanent installation, the USB power adapter allows you to plug your USB power directly into the wall.