OS Details

LG G Watch R has been launched in October 2015.
LG G Watch R have Android Wear OS 1.0, upgradable to 2.1

Screen Dimensions

LG G Watch R screen size is 1.3 inch with ~ 44.2% body ratio of actual device size. Physical dimensions for LG G Watch R device is 1.83 x 2.11 x 0.38 INCH or ( 46.4 x 53.6 x 9.7 MM).

Displaying of Units are in this order "Height x Width x Thickness"

Screen Pixel Density and CSS Pixel Ratio

"Pixel" is smallest unit/element of any display.

The total number of pixels that fit into an inch is referred to as "Screen Density" or "Pixel Density" and it measured as "Pixels Per Inch".
Pixel Desnsity have limits to display Pixels Per Inch depends on different screen sizes. When number of pixels per inch increases than it's screen-size limit, the Display resolution will increase but actual device width/height in pixels remain same. Actual device pixels are known as Device Independent Pixels or CSS Pixel Ratio.

LG G Watch R resolution is 320 x 320 ^PX with ~ 245 pixel desnsity.
LG G Watch R viewport size is 213 x 213 ^PX with ~ 163 actual pixel density, which means it have 1.5 hdpi display pixel density.

Screen Resolution and Viewport

The sum of pixels which are displaying on a device is called as "Screen Resolution". and sum of actual pixels of any device is reffered to as "Viewport".

LG G Watch R have 1.3" physical screen size and its resolution is about 320 x 320 Pixels with approximately 245 PPI pixel density. LG G Watch R has viewport size 213 x 213 Pixels and its pixel ratio is about 1.5.

For better understanding screen actual sizes, viewport sizes, display resolution and about their density click here.

CSS Media Queries

LG G Watch R Media Queries

@media only screen and (min-width: 213px) and (max-width: 319px) { /* Your Styles... */ }

LG G Watch R Min-Width Media Queries

@media only screen and (min-width: 213px) { /* Your Styles... */ }

LG G Watch R Min-Height Media Queries

@media only screen and (min-height: 213px) { /* Your Styles... */ }

LG G Watch R Min-Width Media Queries

@media only screen and (max-width: 213px) { /* Your Styles... */ }

General Media Queries for Smart Watches

@media only screen and (max-width: 319px) { /* Your Styles... */ }

In current era smart watches have no viewport size greater than 319px. So 319px is choose as max-width, also it will not disturb your styles for any kind of mobiles.

Retina 2x Media Query for Smart Watches

@media
  only screen and (-webkit-min-device-pixel-ratio: 2),
  only screen and (   min--moz-device-pixel-ratio: 2),
  only screen and (     -o-min-device-pixel-ratio: 2/1),
  only screen and (        min-device-pixel-ratio: 2),
  only screen and (                min-resolution: 192dpi),
  only screen and (                min-resolution: 2dppx) { 
    /* Retina styles here */
}
                                

LG G Watch R Specifications

• Launch Date October 2015
• Android Wear OS 1.0
• Physical Screen Size 1.3 INCH
• Resolution 320 x 320 PX
• Viewport Size 213 x 213 PX
• Pixel Density 245 PPI
• Device-Independent Pixels 163 PPI
• Pixel Ratio 1.5 hdpi
• Width 320 PX
• Height 320 PX
• Device Width 213 PX
• Device Height 213 PX
• Dimensions 46.4 x 53.6 x 9.7 mm (1.83 x 2.11 x 0.38 in)
• Weight 62 g - 2.19 oz