diff --git a/WaveshareUARTFingerprintSensor/FingerprintSensor.cs b/WaveshareUARTFingerprintSensor/FingerprintSensor.cs
index 89c785d..727ae5d 100644
--- a/WaveshareUARTFingerprintSensor/FingerprintSensor.cs
+++ b/WaveshareUARTFingerprintSensor/FingerprintSensor.cs
@@ -312,6 +312,26 @@ namespace WaveshareUARTFingerprintSensor
             return false;
         }
 
+        public bool DeleteAllUsers()
+        {
+            if (TrySendAndReceive(CommandType.DeleteAllUsers, 0, 0, 0, out var response, 1000))
+            {
+                return response.responseType == ResponseType.Success;
+            }
+
+            return false;
+        }
+
+        public bool DeleteAllUsersWithPermission(UserPermission userPermission)
+        {
+            if (TrySendAndReceive(CommandType.DeleteAllUsers, 0, 0, (byte)userPermission, out var response, 1000))
+            {
+                return response.responseType == ResponseType.Success;
+            }
+
+            return false;
+        }
+
         private void OnWake()
         {
             if (_wakePin.Read())
diff --git a/WaveshareUARTFingerprintSensor/UserPermission.cs b/WaveshareUARTFingerprintSensor/UserPermission.cs
index a9f57ff..9b80fba 100644
--- a/WaveshareUARTFingerprintSensor/UserPermission.cs
+++ b/WaveshareUARTFingerprintSensor/UserPermission.cs
@@ -1,6 +1,6 @@
 namespace WaveshareUARTFingerprintSensor
 {
-    public enum UserPermission
+    public enum UserPermission : byte
     {
         Level1 = 1,
         Level2 = 2,