diff --git a/README.md b/README.md
index 4ca4498..8b3d4c2 100644
--- a/README.md
+++ b/README.md
@@ -17,19 +17,21 @@ as well as the [Bluetooth](https://luxafor.com/bluetooth-busy-light-availability
 The following shows the command line tool setting the color to red.
 
 ```bash
-❯ lux solid red -d 2a0f2c73b72
+❯ lux -d 2a0f2c73b72 solid red
 ```
 
-The following shows the command line tool setting the color to a blinking green.
+The following shows the command line tool setting the color to a blinking green. This example uses the environment
+variable `LUX_DEVICE` to save repeating the device identifier on each call.
 
 ```bash
-❯ lux blink green -d 2a0f2c73b72
+❯ export LUX_DEVICE=2a0f2c73b72
+❯ lux blink green
 ```
 
 The following shows the command line tool turning the light off.
 
 ```bash
-❯ lux -vvv off -d 2a0f2c73b72
+❯ lux -vvv -d 2a0f2c73b72 off
  INFO  luxafor > Setting the color of device '2a0f2c73b72e' to 000000
  INFO  luxafor > call successful
 ```
diff --git a/src/bin/main.rs b/src/bin/main.rs
index 7fcbd49..016aec6 100644
--- a/src/bin/main.rs
+++ b/src/bin/main.rs
@@ -12,6 +12,10 @@ pub(crate) struct CommandLine {
     #[structopt(long, short = "v", parse(from_occurrences))]
     verbose: i8,
 
+    /// The device identifier
+    #[structopt(long, short, env = "LUX_DEVICE")]
+    device: DeviceID,
+
     #[structopt(subcommand)]
     cmd: SubCommand,
 }
@@ -20,40 +24,24 @@ pub(crate) struct CommandLine {
 pub(crate) enum SubCommand {
     /// Set the light to a to a solid color
     Solid {
-        /// The device identifier
-        #[structopt(long, short)]
-        device: DeviceID,
-
         /// The color to set
         #[structopt(name = "COLOR")]
         color: SolidColor,
     },
     /// Set the light to a to a blinking color
     Blink {
-        /// The device identifier
-        #[structopt(long, short)]
-        device: DeviceID,
-
         /// The color to set
         #[structopt(name = "COLOR")]
         color: SolidColor,
     },
     /// Set the light to a to a pre-defined pattern
     Pattern {
-        /// The device identifier
-        #[structopt(long, short)]
-        device: DeviceID,
-
         /// The pattern to set
         #[structopt(long, short)]
         pattern: Pattern,
     },
     /// Turn the light off
-    Off {
-        /// The device identifier
-        #[structopt(long, short)]
-        device: DeviceID,
-    },
+    Off,
 }
 
 fn main() -> Result<(), Box<dyn Error>> {
@@ -71,10 +59,10 @@ fn main() -> Result<(), Box<dyn Error>> {
         .init();
 
     match args.cmd {
-        SubCommand::Solid { device, color } => set_solid_color(device, color, false),
-        SubCommand::Blink { device, color } => set_solid_color(device, color, true),
-        SubCommand::Pattern { device, pattern } => set_pattern(device, pattern),
-        SubCommand::Off { device } => turn_off(device),
+        SubCommand::Solid { color } => set_solid_color(args.device, color, false),
+        SubCommand::Blink { color } => set_solid_color(args.device, color, true),
+        SubCommand::Pattern { pattern } => set_pattern(args.device, pattern),
+        SubCommand::Off => turn_off(args.device),
     }?;
 
     Ok(())
diff --git a/src/lib.rs b/src/lib.rs
index 8af06cd..99d696f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -8,19 +8,21 @@ as well as the [Bluetooth](https://luxafor.com/bluetooth-busy-light-availability
 The following shows the command line tool setting the color to red.
 
 ```bash
-❯ lux solid red -d 2a0f2c73b72
+❯ lux -d 2a0f2c73b72 solid red
 ```
 
-The following shows the command line tool setting the color to a blinking green.
+The following shows the command line tool setting the color to a blinking green. This example uses the environment
+variable `LUX_DEVICE` to save repeating the device identifier on each call.
 
 ```bash
-❯ lux blink green -d 2a0f2c73b72
+❯ export LUX_DEVICE=2a0f2c73b72
+❯ lux blink green
 ```
 
 The following shows the command line tool turning the light off.
 
 ```bash
-❯ lux -vvv off -d 2a0f2c73b72
+❯ lux -vvv -d 2a0f2c73b72 off
  INFO  luxafor > Setting the color of device '2a0f2c73b72e' to 000000
  INFO  luxafor > call successful
 ```