diff --git a/packages/core/onStartTyping/index.test.ts b/packages/core/onStartTyping/index.test.ts
new file mode 100644
index 00000000000..2ca9df7dcd9
--- /dev/null
+++ b/packages/core/onStartTyping/index.test.ts
@@ -0,0 +1,75 @@
+import type { Ref } from 'vue'
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { shallowRef } from 'vue'
+import { onStartTyping } from './index'
+
+describe('onStartTyping', () => {
+  let element: Ref<HTMLInputElement>
+  let callBackFn: any
+
+  beforeEach(() => {
+    element = shallowRef(document.createElement('input'))
+    element.value.tabIndex = 1
+    callBackFn = vi.fn()
+  })
+
+  function dispatchKeyDownEvent(keyCode: number) {
+    const ev = new KeyboardEvent('keydown', { keyCode })
+    document.dispatchEvent(ev)
+  }
+
+  function range(size: number, startAt = 0) {
+    return [...Array.from({ length: size }).keys()].map(i => i + startAt)
+  }
+
+  it('triggers callback with any letter', () => {
+    const letters = range(26, 65)
+
+    onStartTyping(callBackFn)
+
+    letters.forEach((letter) => {
+      document.body.focus()
+      dispatchKeyDownEvent(letter)
+    })
+
+    expect(callBackFn).toBeCalledTimes(letters.length)
+  })
+
+  it('triggers callback with any number', () => {
+    const numbers = range(10, 48)
+    const numpadNumbers = range(10, 96)
+
+    onStartTyping(callBackFn)
+
+    numbers.forEach((number) => {
+      document.body.focus()
+      dispatchKeyDownEvent(number)
+    })
+
+    numpadNumbers.forEach((number) => {
+      document.body.focus()
+      dispatchKeyDownEvent(number)
+    })
+
+    expect(callBackFn).toBeCalledTimes(numbers.length + numpadNumbers.length)
+  })
+
+  it('does not trigger callback with invalid characters', () => {
+    const arrows = range(4, 37)
+    const functionKeys = range(32, 112)
+
+    onStartTyping(callBackFn)
+
+    arrows.forEach((arrow) => {
+      document.body.focus()
+      dispatchKeyDownEvent(arrow)
+    })
+
+    functionKeys.forEach((functionKey) => {
+      document.body.focus()
+      dispatchKeyDownEvent(functionKey)
+    })
+
+    expect(callBackFn).toBeCalledTimes(0)
+  })
+})
diff --git a/packages/core/onStartTyping/index.ts b/packages/core/onStartTyping/index.ts
index 680ba90f4e3..b997f150a53 100644
--- a/packages/core/onStartTyping/index.ts
+++ b/packages/core/onStartTyping/index.ts
@@ -34,17 +34,13 @@ function isTypedCharValid({
     return false
 
   // 0...9
-  if (keyCode >= 48 && keyCode <= 57)
+  if ((keyCode >= 48 && keyCode <= 57) || (keyCode >= 96 && keyCode <= 105))
     return true
 
   // A...Z
   if (keyCode >= 65 && keyCode <= 90)
     return true
 
-  // a...z
-  if (keyCode >= 97 && keyCode <= 122)
-    return true
-
   // All other keys.
   return false
 }