diff --git a/lib/PuppeteerSharp.Tests/EmulationTests/PageEmulateNetworkConditionsTests.cs b/lib/PuppeteerSharp.Tests/EmulationTests/PageEmulateNetworkConditionsTests.cs
index 00806e5b3..6cf7bb1ef 100644
--- a/lib/PuppeteerSharp.Tests/EmulationTests/PageEmulateNetworkConditionsTests.cs
+++ b/lib/PuppeteerSharp.Tests/EmulationTests/PageEmulateNetworkConditionsTests.cs
@@ -13,10 +13,16 @@ public PageEmulateNetworkConditionsTests() : base()
         [Test, Retry(2), PuppeteerTest("emulation.spec", "Emulation Page.emulateNetworkConditions", "should change navigator.connection.effectiveType")]
         public async Task ShouldChangeNavigatorConnectionEffectiveType()
         {
-            var slow3G = Puppeteer.NetworkConditions[NetworkConditions.Slow3G];
+            var fast4G = Puppeteer.NetworkConditions[NetworkConditions.Fast4G];
+            var slow4G = Puppeteer.NetworkConditions[NetworkConditions.Slow4G];
             var fast3G = Puppeteer.NetworkConditions[NetworkConditions.Fast3G];
+            var slow3G = Puppeteer.NetworkConditions[NetworkConditions.Slow3G];
 
             Assert.That(await Page.EvaluateExpressionAsync<string>("window.navigator.connection.effectiveType").ConfigureAwait(false), Is.EqualTo("4g"));
+            await Page.EmulateNetworkConditionsAsync(fast4G);
+            Assert.That(await Page.EvaluateExpressionAsync<string>("window.navigator.connection.effectiveType").ConfigureAwait(false), Is.EqualTo("4g"));
+            await Page.EmulateNetworkConditionsAsync(slow4G);
+            Assert.That(await Page.EvaluateExpressionAsync<string>("window.navigator.connection.effectiveType").ConfigureAwait(false), Is.EqualTo("3g"));
             await Page.EmulateNetworkConditionsAsync(fast3G);
             Assert.That(await Page.EvaluateExpressionAsync<string>("window.navigator.connection.effectiveType").ConfigureAwait(false), Is.EqualTo("3g"));
             await Page.EmulateNetworkConditionsAsync(slow3G);
diff --git a/lib/PuppeteerSharp/NetworkConditions.cs b/lib/PuppeteerSharp/NetworkConditions.cs
index db7af87a7..9a6a8e3c4 100644
--- a/lib/PuppeteerSharp/NetworkConditions.cs
+++ b/lib/PuppeteerSharp/NetworkConditions.cs
@@ -15,6 +15,16 @@ public class NetworkConditions
         /// </summary>
         public const string Fast3G = "Fast 3G";
 
+        /// <summary>
+        /// Key to be used with <see cref="Puppeteer.NetworkConditions()"/>.
+        /// </summary>
+        public const string Slow4G = "Slow 4G";
+
+        /// <summary>
+        /// Key to be used with <see cref="Puppeteer.NetworkConditions()"/>.
+        /// </summary>
+        public const string Fast4G = "Fast 4G";
+
         /// <summary>
         /// Download speed (bytes/s), `-1` to disable.
         /// </summary>
diff --git a/lib/PuppeteerSharp/PredefinedNetworkConditions.cs b/lib/PuppeteerSharp/PredefinedNetworkConditions.cs
index 19dbfafd4..77c44edae 100644
--- a/lib/PuppeteerSharp/PredefinedNetworkConditions.cs
+++ b/lib/PuppeteerSharp/PredefinedNetworkConditions.cs
@@ -13,16 +13,51 @@ public static class PredefinedNetworkConditions
         {
             [NetworkConditions.Slow3G] = new NetworkConditions
             {
+                // ~500Kbps down
                 Download = ((500 * 1000) / 8) * 0.8,
+
+                // ~500Kbps up
                 Upload = ((500 * 1000) / 8) * 0.8,
+
+                // 400ms RTT
                 Latency = 400 * 5,
             },
             [NetworkConditions.Fast3G] = new NetworkConditions
             {
+                // ~1.6 Mbps down
+                Download = ((1.6 * 1000 * 1000) / 8) * 0.9,
+
+                // ~0.75 Mbps up
+                Upload = ((750 * 1000) / 8) * 0.9,
+
+                // 150ms RTT
+                Latency = 150 * 3.75,
+            },
+
+            // alias to Fast 3G to align with Lighthouse (crbug.com/342406608)
+            // and DevTools (crbug.com/342406608),
+            [NetworkConditions.Slow4G] = new NetworkConditions
+            {
+                // ~1.6 Mbps down
                 Download = ((1.6 * 1000 * 1000) / 8) * 0.9,
+
+                // ~0.75 Mbps up
                 Upload = ((750 * 1000) / 8) * 0.9,
+
+                // 150ms RTT
                 Latency = 150 * 3.75,
             },
+            [NetworkConditions.Fast4G] = new NetworkConditions
+            {
+                // 9 Mbps down
+                Download = ((9 * 1000 * 1000) / 8) * 0.9,
+
+                // 1.5 Mbps up
+                Upload = ((1.5 * 1000 * 1000) / 8) * 0.9,
+
+                // 60ms RTT
+                Latency = 60 * 2.75,
+            },
         };
 
         private static readonly Lazy<IReadOnlyDictionary<string, NetworkConditions>> _readOnlyConditions =