The final test before any Sensor Watch release: power testing. At wrist temperature, the new Sensor Watch Lite board achieves current consumption on the order of 6 microamperes at 3 volts, or under 20 microwatts in wake mode. Sleep mode will be less. Either way, this is very good news; the old version of Sensor Watch consumed nearly 34 microwatts in wake mode — which was, to be clear, pretty good. But this is better.