diff --git a/src/BLEOTA.cpp b/src/BLEOTA.cpp
index e69de29..053c438 100644
--- a/src/BLEOTA.cpp
+++ b/src/BLEOTA.cpp
@@ -0,0 +1,22 @@
+#include "BLEOTA.h"
+
+BLEOTAClass::BLEOTAClass(){
+    _pVersionNumber = new BLECharacteristic(VERSION_NUMBER_UUID, BLECharacteristic::PROPERTY_NOTIFY);
+    _pVersionNumberDescriptor = new BLEDescriptor(VERSION_NUMBER_DESCRIPTOR_UUID);
+};
+
+void BLEOTAClass::begin(BLEServer* server, char* versionNumber = "1.0.0") {
+    // set internal versionNumber
+    _vNum = versionNumber;
+    // set internal server
+    _pServer = server;
+    // create service
+    BLEService* otaService = _pServer->createService(OTA_SERVICE_UUID);
+    // version number property
+    otaService->addCharacteristic(_pVersionNumber);
+    _pVersionNumber->setValue(_vNum);
+    _pVersionNumberDescriptor->setValue("Version Number");
+    _pVersionNumber->addDescriptor(_pVersionNumberDescriptor);
+
+    otaService->start();
+}
\ No newline at end of file
diff --git a/src/BLEOTA.h b/src/BLEOTA.h
index cee2f2e..1f819eb 100644
--- a/src/BLEOTA.h
+++ b/src/BLEOTA.h
@@ -1,4 +1,22 @@
 #ifndef BLEOTA
 #define BLEOTA
 
+#include <Arduino.h>
+#include <BLEServer.h>
+
+#define OTA_SERVICE_UUID "71a4438e-fd52-4b15-b3d2-ec0e3e56193b"
+#define VERSION_NUMBER_UUID "1978a3df-c009-4837-b295-57ef429dde8c"
+#define VERSION_NUMBER_DESCRIPTOR_UUID "1e0c35d1-ba03-4f4d-a99c-bac7664d95ed"
+
+class BLEOTAClass {
+    public:
+        BLEOTAClass();
+        void begin(BLEServer* server, char* versionNumber = "1.0.0");
+    private:
+        BLEServer* _pServer;
+        char* _vNum;
+        BLECharacteristic* _pVersionNumber;
+        BLEDescriptor* _pVersionNumberDescriptor;
+};
+
 #endif /* BLEOTA */
\ No newline at end of file