diff --git a/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation.meta b/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation.meta
new file mode 100644
index 0000000..ec11650
--- /dev/null
+++ b/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation.meta
@@ -0,0 +1,8 @@
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diff --git a/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/NSNumber.cs b/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/NSNumber.cs
new file mode 100644
index 0000000..4bdd251
--- /dev/null
+++ b/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/NSNumber.cs
@@ -0,0 +1,47 @@
+using System;
+
+namespace CoreBluetooth.Foundation
+{
+    public class NSNumber : IDisposable
+    {
+        internal SafeNSNumberHandle Handle { get; private set; }
+
+        internal NSNumber(bool value)
+        {
+            Handle = NativeMethods.ns_number_new_bool(value);
+        }
+
+        internal NSNumber(int value)
+        {
+            Handle = NativeMethods.ns_number_new_int(value);
+        }
+
+        internal NSNumber(SafeNSNumberHandle handle)
+        {
+            Handle = handle;
+        }
+
+        internal NSNumber(IntPtr handle)
+        {
+            Handle = new SafeNSNumberHandle(handle);
+        }
+
+        public bool BoolValue()
+        {
+            ExceptionUtils.ThrowObjectDisposedExceptionIf(Handle.IsInvalid, this);
+            return NativeMethods.ns_number_bool_value(Handle);
+        }
+
+        public int IntValue()
+        {
+            ExceptionUtils.ThrowObjectDisposedExceptionIf(Handle.IsInvalid, this);
+            return NativeMethods.ns_number_int_value(Handle);
+        }
+
+        public void Dispose()
+        {
+            if (Handle != null && !Handle.IsInvalid)
+                Handle.Dispose();
+        }
+    }
+}
diff --git a/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/NSNumber.cs.meta b/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/NSNumber.cs.meta
new file mode 100644
index 0000000..90e327a
--- /dev/null
+++ b/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/NSNumber.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/NativeMethods.cs b/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/NativeMethods.cs
new file mode 100644
index 0000000..56338ac
--- /dev/null
+++ b/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/NativeMethods.cs
@@ -0,0 +1,29 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace CoreBluetooth.Foundation
+{
+    internal static class NativeMethods
+    {
+#if UNITY_IOS && !UNITY_EDITOR
+        const string DLL_NAME = "__Internal";
+#else
+        const string DLL_NAME = "libCoreBluetoothForUnity";
+#endif
+
+        [DllImport(DLL_NAME, CallingConvention = CallingConvention.Cdecl)]
+        internal static extern void ns_object_release(IntPtr handle);
+
+        [DllImport(DLL_NAME, CallingConvention = CallingConvention.Cdecl)]
+        internal static extern SafeNSNumberHandle ns_number_new_bool([MarshalAs(UnmanagedType.I1)] bool value);
+
+        [DllImport(DLL_NAME, CallingConvention = CallingConvention.Cdecl)]
+        internal static extern SafeNSNumberHandle ns_number_new_int(int value);
+
+        [DllImport(DLL_NAME, CallingConvention = CallingConvention.Cdecl)]
+        internal static extern bool ns_number_bool_value(SafeNSNumberHandle handle);
+
+        [DllImport(DLL_NAME, CallingConvention = CallingConvention.Cdecl)]
+        internal static extern int ns_number_int_value(SafeNSNumberHandle handle);
+    }
+}
diff --git a/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/NativeMethods.cs.meta b/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/NativeMethods.cs.meta
new file mode 100644
index 0000000..8d54101
--- /dev/null
+++ b/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/NativeMethods.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/SafeNSNumberHandle.cs b/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/SafeNSNumberHandle.cs
new file mode 100644
index 0000000..bfc1588
--- /dev/null
+++ b/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/SafeNSNumberHandle.cs
@@ -0,0 +1,10 @@
+using System;
+
+namespace CoreBluetooth.Foundation
+{
+    internal class SafeNSNumberHandle : SafeNSObjectHandle
+    {
+        public SafeNSNumberHandle() : base() { }
+        public SafeNSNumberHandle(IntPtr handle) : base(handle) { }
+    }
+}
diff --git a/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/SafeNSNumberHandle.cs.meta b/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/SafeNSNumberHandle.cs.meta
new file mode 100644
index 0000000..4121d56
--- /dev/null
+++ b/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/SafeNSNumberHandle.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/SafeNSObjectHandle.cs b/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/SafeNSObjectHandle.cs
new file mode 100644
index 0000000..4a0473c
--- /dev/null
+++ b/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/SafeNSObjectHandle.cs
@@ -0,0 +1,20 @@
+using System;
+using Microsoft.Win32.SafeHandles;
+
+namespace CoreBluetooth.Foundation
+{
+    public abstract class SafeNSObjectHandle : SafeHandleZeroOrMinusOneIsInvalid
+    {
+        protected SafeNSObjectHandle() : base(true) { }
+        protected SafeNSObjectHandle(IntPtr handle) : base(true)
+        {
+            SetHandle(handle);
+        }
+
+        protected override bool ReleaseHandle()
+        {
+            NativeMethods.ns_object_release(handle);
+            return true;
+        }
+    }
+}
diff --git a/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/SafeNSObjectHandle.cs.meta b/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/SafeNSObjectHandle.cs.meta
new file mode 100644
index 0000000..49e32d9
--- /dev/null
+++ b/Packages/com.teach310.core-bluetooth-for-unity/Runtime/Foundation/SafeNSObjectHandle.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Packages/com.teach310.core-bluetooth-for-unity/Tests/Runtime/Foundation.meta b/Packages/com.teach310.core-bluetooth-for-unity/Tests/Runtime/Foundation.meta
new file mode 100644
index 0000000..d90eaa3
--- /dev/null
+++ b/Packages/com.teach310.core-bluetooth-for-unity/Tests/Runtime/Foundation.meta
@@ -0,0 +1,8 @@
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diff --git a/Packages/com.teach310.core-bluetooth-for-unity/Tests/Runtime/Foundation/NSNumberTests.cs b/Packages/com.teach310.core-bluetooth-for-unity/Tests/Runtime/Foundation/NSNumberTests.cs
new file mode 100644
index 0000000..ce044dd
--- /dev/null
+++ b/Packages/com.teach310.core-bluetooth-for-unity/Tests/Runtime/Foundation/NSNumberTests.cs
@@ -0,0 +1,31 @@
+using CoreBluetooth.Foundation;
+using NUnit.Framework;
+
+namespace CoreBluetoothTests.Foundation
+{
+    public class NSNumberTests
+    {
+        [Test]
+        public void IntValue()
+        {
+            using var nsNumber = new NSNumber(2);
+            Assert.That(nsNumber.Handle, Is.Not.Null);
+            Assert.That(nsNumber.Handle.IsInvalid, Is.False);
+            Assert.That(nsNumber.IntValue, Is.EqualTo(2));
+        }
+
+        [Test]
+        public void BoolValue()
+        {
+            using var trueNumber = new NSNumber(true);
+            Assert.That(trueNumber.Handle, Is.Not.Null);
+            Assert.That(trueNumber.Handle.IsInvalid, Is.False);
+            Assert.That(trueNumber.BoolValue, Is.True);
+
+            using var falseNumber = new NSNumber(false);
+            Assert.That(falseNumber.Handle, Is.Not.Null);
+            Assert.That(falseNumber.Handle.IsInvalid, Is.False);
+            Assert.That(falseNumber.BoolValue, Is.False);
+        }
+    }
+}
diff --git a/Packages/com.teach310.core-bluetooth-for-unity/Tests/Runtime/Foundation/NSNumberTests.cs.meta b/Packages/com.teach310.core-bluetooth-for-unity/Tests/Runtime/Foundation/NSNumberTests.cs.meta
new file mode 100644
index 0000000..f668cdb
--- /dev/null
+++ b/Packages/com.teach310.core-bluetooth-for-unity/Tests/Runtime/Foundation/NSNumberTests.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Plugins/CoreBluetoothForUnity/Sources/CoreBluetoothForUnity/FoundationForUnity/FoundationForUnity.swift b/Plugins/CoreBluetoothForUnity/Sources/CoreBluetoothForUnity/FoundationForUnity/FoundationForUnity.swift
new file mode 100644
index 0000000..d249030
--- /dev/null
+++ b/Plugins/CoreBluetoothForUnity/Sources/CoreBluetoothForUnity/FoundationForUnity/FoundationForUnity.swift
@@ -0,0 +1,30 @@
+import Foundation
+
+@_cdecl("ns_object_release")
+public func ns_object_release(_ handle: UnsafeRawPointer) {
+    Unmanaged<NSObject>.fromOpaque(handle).release()
+}
+
+@_cdecl("ns_number_new_bool")
+public func ns_number_new_bool(_ value: Bool) -> UnsafeMutableRawPointer {
+    let instance = NSNumber(value: value)
+    return Unmanaged.passRetained(instance).toOpaque()
+}
+
+@_cdecl("ns_number_new_int")
+public func ns_number_new_int(_ value: Int32) -> UnsafeMutableRawPointer {
+    let instance = NSNumber(value: value)
+    return Unmanaged.passRetained(instance).toOpaque()
+}
+
+@_cdecl("ns_number_bool_value")
+public func ns_number_bool_value(_ handle: UnsafeRawPointer) -> Bool {
+    let instance = Unmanaged<NSNumber>.fromOpaque(handle).takeUnretainedValue()
+    return instance.boolValue
+}
+
+@_cdecl("ns_number_int_value")
+public func ns_number_int_value(_ handle: UnsafeRawPointer) -> Int32 {
+    let instance = Unmanaged<NSNumber>.fromOpaque(handle).takeUnretainedValue()
+    return instance.int32Value
+}