diff --git a/src/index.ts b/src/index.ts
index bda72bf..88d67dc 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,3 +1,4 @@
+/// <reference types="cordova-plugin-ble-central" />
 import { parseXml, XmlDocument, XmlElement, XmlText } from "@rgrove/parse-xml";
 
 export type versionNotes = {
@@ -10,11 +11,25 @@ export type versionNotes = {
 export default class Updater {
         public archiveURL: string;
         public feedType: string;
-        constructor(archiveURL: string = "/", feedType: string = "atom") {
+
+        public bleObject: BLECentralPlugin.BLECentralPluginStatic;
+        protected bleDeviceId: string;
+
+        private readonly _updaterServiceUUID: string = "71a4438e-fd52-4b15-b3d2-ec0e3e56193b";
+        private readonly _updaterVersionCharactersiticUUID: string = "1978a3df-c009-4837-b295-57ef429dde8c";
+
+        constructor(archiveURL: string = "/", feedType: string = "atom", bleObject?: BLECentralPlugin.BLECentralPluginStatic) {
                 this.archiveURL = archiveURL;
                 this.feedType = feedType;
+                if (bleObject) {
+                        this.bleObject = bleObject;
+                }
         }
         
+        /*
+        FEEDS
+        */
+
         private async getRawArchive(): Promise<string> {
                 const res = await fetch(`http://cors.emaker.limited/?url=${this.archiveURL}.${this.feedType}`, {
                         // "mode": "cors"
@@ -105,5 +120,57 @@ export default class Updater {
                         return this.rssGetArchive()
                 }
         }
+
+        /*
+        BLUETOOTH
+        */
+
+        public setDeviceId(id: string): void {
+                this.bleDeviceId = id;
+        }
+
+        private bytesToString(buffer: ArrayBuffer): string {
+                return String.fromCharCode.apply(null, new Uint8Array(buffer));
+        }
+
+        private async readVersionNumber(): Promise<string> {
+                return new Promise((resolve, reject) => {
+                        this.bleObject.read(
+                        this.bleDeviceId, 
+                        this._updaterServiceUUID, 
+                        this._updaterVersionCharactersiticUUID, 
+                        (rawData: ArrayBuffer) => {
+                                resolve(this.bytesToString(rawData));
+                        },
+                        (error: string) => {
+                                reject(`Error: ${error}`);
+                        }
+                )});
+        }
+
+        private async getLatestVersion(): Promise<string> {
+                let feed: versionNotes[] = await this.getArchive();
+                let newestDate: Date = feed[0].date as Date;
+                let i: number = 0;
+                feed.forEach((item: versionNotes, index: number) => {
+                        if (item.date > newestDate) {
+                                newestDate = item.date as Date;
+                                i = index;
+                        }
+                });
+                return feed[i].title;
+        }
+
+        public async checkForUpdate(): Promise<boolean> {
+                // read device value
+                const deviceVersion = await this.readVersionNumber();
+                // compare with latest version
+                const latestVersion = await this.getLatestVersion();
+                if (deviceVersion != latestVersion) {
+                        return  true;
+                }
+                // update
+                return false;
+        }
 }