diff --git a/Discovery/Discovery.h b/Discovery/Discovery.h
index 724f5f5..6ae8745 100644
--- a/Discovery/Discovery.h
+++ b/Discovery/Discovery.h
@@ -12,12 +12,32 @@
 #import <CoreLocation/CoreLocation.h>
 #import "BLEUser.h"
 
+/** Start options */
+typedef NS_ENUM(NSInteger, DIStartOptions) {
+    DIStartAdvertisingAndDetecting = 0,
+    DIStartAdvertisingOnly,
+    DIStartDetectingOnly,
+    DIStartNone
+};
+
 @interface Discovery : NSObject<CBCentralManagerDelegate, CBPeripheralManagerDelegate, CBPeripheralDelegate>
 
 
 /**
  * Initialize the Discovery object with a UUID specific to your app, and a username specific to your device.
- * The usersBlock is triggered periodically in order of users' proximity. It
+ * The usersBlock is triggered periodically in order of users' proximity.
+ * The startOptions determine if the beacon should start advertising, broadcasting, both, or none.
+ */
+- (instancetype)initWithUUID:(CBUUID *)uuid
+                    username:(NSString *)username
+                startOption:(DIStartOptions)startOption
+                  usersBlock:(void (^)(NSArray *users, BOOL usersChanged))usersBlock;
+
+
+/**
+ * Initialize the Discovery object with a UUID specific to your app, and a username specific to your device.
+ * The usersBlock is triggered periodically in order of users' proximity.
+ * The Discovery object starts both advertising and detecting.
  */
 - (instancetype)initWithUUID:(CBUUID *)uuid
                     username:(NSString *)username
@@ -28,6 +48,12 @@
  */
 - (BLEUser *)userWithPeripheralId:(NSString *)peripheralId;
 
+/**
+ * Changing these properties will start/stop advertising/discovery
+ */
+@property (nonatomic) BOOL shouldAdvertise;
+@property (nonatomic) BOOL shouldDiscover;
+
 /**
  * UUID is used for id as advertisement, peripheral services and characteristics.
  * It should be unique to you app, not to your device. Otherwise the peers won't be able to discover each other.
diff --git a/Discovery/Discovery.m b/Discovery/Discovery.m
index e1c1b17..3a644e0 100644
--- a/Discovery/Discovery.m
+++ b/Discovery/Discovery.m
@@ -14,8 +14,10 @@ @interface Discovery()
 @end
 
 @implementation Discovery
+
 - (instancetype)initWithUUID:(CBUUID *)uuid
-                 username:(NSString *)username
+                    username:(NSString *)username
+                startOption:(DIStartOptions)startOption
                   usersBlock:(void (^)(NSArray *users, BOOL usersChanged))usersBlock {
     self = [super init];
     if(self) {
@@ -28,6 +30,8 @@ - (instancetype)initWithUUID:(CBUUID *)uuid
         _userTimeoutInterval = 3;
         _updateInterval = 2;
         
+
+
         // listen for UIApplicationDidEnterBackgroundNotification
         [[NSNotificationCenter defaultCenter] addObserver:self
                                                  selector:@selector(appDidEnterBackground:)
@@ -47,15 +51,77 @@ - (instancetype)initWithUUID:(CBUUID *)uuid
         // start the central and peripheral managers
         self.queue = dispatch_queue_create("com.omerfarukgul.discovery", DISPATCH_QUEUE_SERIAL);
         
-        self.centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:self.queue];
-        self.peripheralManager = [[CBPeripheralManager alloc] initWithDelegate:self queue:self.queue];
+        _shouldAdvertise = NO;
+        _shouldDiscover = NO;
+        
+        switch (startOption) {
+            case DIStartAdvertisingAndDetecting:
+                self.shouldAdvertise = YES;
+                self.shouldDiscover = YES;
+                break;
+            case DIStartAdvertisingOnly:
+                self.shouldAdvertise = YES;
+                break;
+            case DIStartDetectingOnly:
+                self.shouldDiscover = YES;
+                break;
+            case DIStartNone:
+            default:
+                break;
+        }
         
-        [self startTimer];
     }
     
     return self;
 }
 
+-(void)setShouldAdvertise:(BOOL)shouldAdvertise {
+    if(_shouldAdvertise == shouldAdvertise)
+        return;
+    
+    _shouldAdvertise = shouldAdvertise;
+    
+    if(shouldAdvertise) {
+        if (!self.peripheralManager)
+            self.peripheralManager = [[CBPeripheralManager alloc] initWithDelegate:self queue:self.queue];
+    } else {
+        if (self.peripheralManager) {
+            [self.peripheralManager stopAdvertising];
+            self.peripheralManager.delegate = nil;
+            self.peripheralManager = nil;
+        }
+    }
+    
+    
+}
+
+-(void)setShouldDiscover:(BOOL)shouldDiscover {
+    if(_shouldDiscover == shouldDiscover)
+        return;
+    
+    _shouldDiscover = shouldDiscover;
+    
+    if(shouldDiscover) {
+        if (!self.centralManager)
+            self.centralManager = [[CBCentralManager alloc] initWithDelegate:self queue:self.queue];
+        if (!self.timer)
+            [self startTimer];
+    } else {
+        if (self.centralManager) {
+            [self.centralManager stopScan];
+            self.centralManager.delegate = nil;
+            self.centralManager = nil;
+        }
+        if (self.timer)
+            [self stopTimer];
+    }
+}
+
+-(instancetype)initWithUUID:(CBUUID *)uuid username:(NSString *)username usersBlock:(void (^)(NSArray *, BOOL))usersBlock {
+    self = [self initWithUUID:uuid username:username startOption:DIStartAdvertisingAndDetecting usersBlock:usersBlock];
+    return self;
+}
+
 
 - (void)startTimer {
     self.timer = [NSTimer scheduledTimerWithTimeInterval:self.updateInterval target:self
diff --git a/DiscoveryExample.xcodeproj/project.pbxproj b/DiscoveryExample.xcodeproj/project.pbxproj
index 7df3aa7..429d98f 100644
--- a/DiscoveryExample.xcodeproj/project.pbxproj
+++ b/DiscoveryExample.xcodeproj/project.pbxproj
@@ -90,6 +90,7 @@
 		17B568771A87864B007E0C5F = {
 			isa = PBXGroup;
 			children = (
+				9DC3B4FC1A9E0FCF00B1603B /* Discovery */,
 				17B568821A87864B007E0C5F /* DiscoveryExample */,
 				17B5689C1A87864B007E0C5F /* DiscoveryExampleTests */,
 				17B568811A87864B007E0C5F /* Products */,
@@ -113,7 +114,6 @@
 				17C70CB21A878EA200723200 /* Utils */,
 				17B568AD1A87885A007E0C5F /* Controllers */,
 				17B568871A87864B007E0C5F /* AppDelegate.h */,
-				9DC3B4FC1A9E0FCF00B1603B /* Discovery */,
 				17B568881A87864B007E0C5F /* AppDelegate.m */,
 				17B568901A87864B007E0C5F /* Images.xcassets */,
 				17B568921A87864B007E0C5F /* LaunchScreen.xib */,
@@ -255,7 +255,7 @@
 				TargetAttributes = {
 					17B5687F1A87864B007E0C5F = {
 						CreatedOnToolsVersion = 6.1;
-						DevelopmentTeam = NZPAC7Q696;
+						DevelopmentTeam = 66SW7BQ2SM;
 						SystemCapabilities = {
 							com.apple.BackgroundModes = {
 								enabled = 1;
@@ -264,6 +264,7 @@
 					};
 					17B568981A87864B007E0C5F = {
 						CreatedOnToolsVersion = 6.1;
+						DevelopmentTeam = 66SW7BQ2SM;
 						TestTargetID = 17B5687F1A87864B007E0C5F;
 					};
 				};