The Sparklet automatically puts itself to sleep when disconnected, it is still listening for a Bluetooth connection or when it is plugged in using USB so it can wake up when requested. The batteries will last well over a year in this sleeping state.
If you want to truly turn the processor off such as when you want to ship it:
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Using the Microsoft Expressive Pixels application connect to the Sparklet using Bluetooth only.
- Open the Developer Console view, and type in DEEPSLEEP followed by the Return key. The blue power module light will turn off and the system will be powered down.
- The system can only be woken up if it is plugged into a USB power source, or the Reset button is pressed.