How I use this hidden Android security feature to easily turn off sensors - and where to enable it

Open the Settings app. You can do this by either tapping Settings within the App Drawer, or tapping the gear icon in the Notification Shade. From within Settings, tap "About phone," and then scroll to ...

Aqara’s cord-free presence sensor runs for up to three years on battery power

The $50 sensor runs on two coin cell batteries so you don’t need a nearby power source for installation.

First Graphene-Based Solar Cells Used to Power Temperature Sensors

Tests confirm graphene-based energy harvesters can use ambient energy to run ultra-low power sensors — the first hurdle in developing autonomous sensor systems.