diff --git a/cli.go b/cli.go
index 81fecf4..10f474f 100644
--- a/cli.go
+++ b/cli.go
@@ -13,6 +13,8 @@ var ctx context.Context
 var cancel context.CancelFunc
 var ch_discover chan notify.EventInfo
 var _managerObj *_manager
+var registerHandleFunc func(uuid string)
+var removeHandleFunc func(uuid string)
 
 func init() {
 	ctx, cancel = context.WithCancel(context.Background())
@@ -24,10 +26,21 @@ func init() {
 	_managerObj = &_manager{
 		devicesWithUUID:  devWithUUID,
 		devicesWithIface: devWithIface,
+		chanForSync:      chanForSync,
 		SyncListener:     &SyncHandler{devices: devWithUUID, chanForSync: chanForSync},
 		RecvListener:     &RecvHandler{devices: devWithIface, chanForSync: chanForSync},
 	}
 
+	registerHandleFunc = nil
+	removeHandleFunc = nil
+}
+
+func AddRegisterHandleFunc(h func(uuid string)) {
+	registerHandleFunc = h
+}
+
+func AddRemoveHandleFunc(h func(uuid string)) {
+	removeHandleFunc = h
 }
 
 func Close() {
@@ -38,6 +51,10 @@ func Sync(key string, param map[string]interface{}) {
 	_managerObj.onSync(key, param)
 }
 
+func AddRecvListener(h EventHandler) {
+	_managerObj.addRecvListener(h)
+}
+
 func SetDevicePropsToSync(uuid string, propsToSync []string) error {
 	device, ok := _managerObj.devicesWithUUID[uuid]
 	if !ok {
@@ -66,6 +83,13 @@ func Run() error {
 			log.Println("manager exit")
 			return nil
 		}
-		_managerObj.onAdded(e.Path())
+		switch e.Event() {
+		case notify.Create:
+			_managerObj.onAdded(e.Path())
+			// case notify.Remove:
+			// 	log.Println("USB Disconnected!!")
+			// 	_managerObj.onAdded(e.Path())
+		}
+
 	}
 }
diff --git a/communication.go b/communication.go
index 0ef8a48..ad05cce 100644
--- a/communication.go
+++ b/communication.go
@@ -15,6 +15,7 @@ func recv(port io.Reader, r Receiver) {
 		if err != nil {
 			if err == io.EOF {
 				log.Println("USB is disconnected")
+				_managerObj.onRemoved(port)
 				return
 			}
 		}
diff --git a/examples/main.go b/examples/main.go
index c0cf7a0..ad80cf4 100644
--- a/examples/main.go
+++ b/examples/main.go
@@ -11,8 +11,19 @@ import (
 )
 
 func main() {
-	go manager.Run()
+	manager.AddRecvListener(manager.NewEventHandler(func(e manager.Event) {
+		fmt.Println("RECV: ", e.Params())
+	}))
 
+	manager.AddRegisterHandleFunc(func(dname string) {
+		fmt.Println(dname, " is registered!!")
+	})
+
+	manager.AddRemoveHandleFunc(func(dname string) {
+		fmt.Println(dname, " is removed!!")
+	})
+	go manager.Run()
+	defer manager.Close()
 	for {
 		fmt.Print("> ")
 		reader := bufio.NewReader(os.Stdin)
diff --git a/interface.go b/interface.go
index 92f0d32..9f024b6 100644
--- a/interface.go
+++ b/interface.go
@@ -15,3 +15,7 @@ type Receiver interface {
 type Syncronizer interface {
 	onSync(key interface{}, params map[string]interface{})
 }
+
+
+
+
diff --git a/listener.go b/listener.go
index 131e179..2fe4e14 100644
--- a/listener.go
+++ b/listener.go
@@ -85,6 +85,7 @@ func (sh *SyncHandler) Handle(e Event) {
 type RecvHandler struct {
 	devices     map[interface{}]*_device
 	chanForSync map[string]chan map[string]interface{}
+	next        EventHandler
 }
 
 func (rh *RecvHandler) Handle(e Event) {
@@ -95,14 +96,19 @@ func (rh *RecvHandler) Handle(e Event) {
 
 	param := e.Params()
 	code, _ := param["code"].(float64)
-	if int(code) != 100 {
-		device.states = param
+	if int(code) == 100 {
+		return
 	}
 
+	device.states = param
 	channel, ok := rh.chanForSync[device.IfaceName]
 	if ok {
 		channel <- device.states
 	}
 
+	if rh.next != nil {
+		rh.next.Handle(e)
+	}
+
 	// fmt.Println("recv] ", device.states)
 }
diff --git a/manager.go b/manager.go
index 74e244b..0fc35af 100644
--- a/manager.go
+++ b/manager.go
@@ -4,6 +4,7 @@ import (
 	"bufio"
 	"encoding/json"
 	"fmt"
+	"io"
 	"log"
 
 	"github.com/jacobsa/go-serial/serial"
@@ -12,13 +13,37 @@ import (
 type _manager struct {
 	devicesWithUUID  map[string]*_device
 	devicesWithIface map[interface{}]*_device
+	chanForSync      map[string]chan map[string]interface{}
+	RegisterListener EventHandler
 	SyncListener     EventHandler
 	RecvListener     EventHandler
 }
 
 func (m *_manager) onRegistered(dev *_device) {
+	// if m.RegisterListener != nil {
+	// 	m.RegisterListener.Handle(&EventStruct{key: })
+	// }
+	if registerHandleFunc != nil {
+		registerHandleFunc(dev.UUID)
+	}
 	go recv(dev.Iface, m)
-	log.Println("> End onRegistered")
+}
+
+func (m *_manager) onRemoved(port io.Reader) {
+	dev := _managerObj.devicesWithIface[port]
+	delete(m.devicesWithUUID, dev.UUID)
+	delete(m.devicesWithIface, port)
+	ch, ok := m.chanForSync[dev.UUID]
+	if ok {
+		close(ch)
+		delete(m.chanForSync, dev.UUID)
+	}
+
+	if removeHandleFunc != nil {
+		removeHandleFunc(dev.UUID)
+	}
+	// log.Println(m.devicesWithUUID)
+	// log.Println(m.devicesWithIface)
 }
 
 func (m *_manager) onAdded(iface string) {
@@ -92,3 +117,7 @@ func (m *_manager) onRecv(key interface{}, params map[string]interface{}) {
 		m.RecvListener.Handle(&EventStruct{key: key, params: params})
 	}
 }
+
+func (m *_manager) addRecvListener(h EventHandler) {
+	m.RecvListener = &RecvHandler{next: h, devices: m.devicesWithIface, chanForSync: m.chanForSync}
+}
diff --git a/puserial/serial.go b/puserial/serial.go
index 155aed4..a1ccc07 100644
--- a/puserial/serial.go
+++ b/puserial/serial.go
@@ -29,7 +29,7 @@ func WatchNewDevice(ctx context.Context, ch_discover chan<- notify.EventInfo) er
 	defer close(ch_discover)
 
 	filter := make(chan notify.EventInfo, 1)
-	if err := notify.Watch("/dev", filter, notify.Create, notify.Remove); err != nil {
+	if err := notify.Watch("/dev", filter, notify.Create); err != nil {
 		return err
 	}
 	defer notify.Stop(filter)
diff --git a/structure.go b/structure.go
index 0e29c27..27a90e1 100644
--- a/structure.go
+++ b/structure.go
@@ -13,3 +13,16 @@ func (es *EventStruct) Params() map[string]interface{} {
 func (es *EventStruct) Key() interface{} {
 	return es.key
 }
+
+type EventHandlerStruct struct {
+	EventHandler
+	HandleFunc func(e Event)
+}
+
+func (ehs *EventHandlerStruct) Handle(e Event) {
+	ehs.HandleFunc(e)
+}
+
+func NewEventHandler(h func(e Event)) *EventHandlerStruct {
+	return &EventHandlerStruct{HandleFunc: h}
+}