diff --git a/index.d.ts b/index.d.ts
index 052bfd5..fbfa7d2 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -120,18 +120,21 @@ declare namespace useragent {
     /** @deprecated */
     patch: string;
 
+    brand: string;
+
+    model: string;
+
     /**
      * The representation of a parsed Device.
+     *
      * @param [family='Other'] The name of the device
-     * @param [major='0'] Major version of the device
-     * @param [minor='0'] Minor version of the device
-     * @param [patch='0'] Patch version of the device
+     * @param [brand='Other'] The brand of the device
+     * @param [model='Other'] The model of the device
      */
     constructor(
       family?: string,
-      major?: string,
-      minor?: string,
-      patch?: string
+      brand?: string,
+      model?: string
     );
 
     /**
@@ -149,6 +152,8 @@ declare namespace useragent {
      */
     toJSON(): {
       family: string;
+      brand: string;
+      model: string;
       major: string | undefined;
       minor: string | undefined;
       patch: string | undefined;
diff --git a/index.js b/index.js
index dc6e819..97a734c 100644
--- a/index.js
+++ b/index.js
@@ -282,9 +282,8 @@ OperatingSystem.prototype.toJSON = function toJSON(){
  *
  * @constructor
  * @param {String} family The name of the device
- * @param {String} major Major version of the device
- * @param {String} minor Minor version of the device
- * @param {String} patch Patch version of the device
+ * @param {String} brand The brand of the device 
+ * @param {String} model The model of the device 
  * @api public
  */
 function Device(family, brand, model) {
@@ -609,4 +608,4 @@ function replace(str, matches) {
     replacement = replacement.replace(sub[0], matches[sub[1]])
   }
   return replacement;
-}
\ No newline at end of file
+}