# Sensors Sensors are render pros that track some behavior and re-render on state change. For example, the below `
` will be re-rendered every time mouse position changes. ```jsx {({posX, posY}) =>
} ``` `libreact` comes with plenty of sensors built-in. - [``](./ActiveSensor.md) — tracks if element is being "pressed" on by `mousedown`. - [``](./BatterySensor.md) — tracks battery status. - [``](./ExitSensor.md) — notifies component when it is being un-mounted. - [``](./FocusSensor.md) — tracks element has focus. - [``](./GeoLocationSensor.md) — tracks device geographical location. - [``](./HoverSensor.md) — tracks element's hover status. - [``](./IdleSensor.md) — tracks is user is active on the page. - [``](./MediaDeviceSensor.md) — tracks media devices connected to your device. - [``](./MediaSensor.md) — tracks matches of a media query. - [``](./MotionSensor.md) — tracks physical motion of your device. - [``](./MouseSensor.md) — tracks mouse position inside an element. - [``](./NetworkSensor.md) — tracks network connectivity and type state. - [``](./LightSensor.md) — tracks physical lightning sensor state. - [``](./LocationSensor.md) — tracks browser location. - [``](./OrientationSensor.md) — tracks physical device orientation. - [``](./ScratchSensor.md) — tracks user "scratches" aka swipes. - [``](./ScrollSensor.md) — tracks scroll offsets in a DOM element. - [``](./SizeSensor.md) — tracks child DOM element size. - [``](./WidthSensor.md) — same as ``, but only re-renders on width change. - [``](./ViewportSensor.md) — tracks elements visibility in viewport. - [``](./ViewportSensor.md#viewportscrollsensor) and [``](./ViewportSensor.md#viewportobserversensor) - [``](./WindowScrollSensor.md) — tracks window scroll position. - [``](./WindowSizeSensor.md) — tracks window size. - [``](./WindowWidthSensor.md) — tracks window width. Most sensors have also corresponding HOC and class decorator that provide the same functionality. For example, [``](./NetworkSensor.md) render prop component has a corresponding [`withNetowrk()`](./NetworkSensor.md#withnetwork-hoc) HOC and [`@withNetwork`](./NetworkSensor.md#withnetwork-decorator) decorator.