diff --git a/device_profile.py b/device_profile.py
index e63f01a..d6feec6 100644
--- a/device_profile.py
+++ b/device_profile.py
@@ -21,6 +21,114 @@
 This module defines the DeviceProfile class with holds descriptors of device
 """
 
-class DeviceProfile(object):
-    pass    
-	
+class DeviceProfile(object):   
+    
+    def __init__(self, prefix = None, location = None, manufacturer = None, category = None, type_ = None, model = None, serialNumber = None, serviceProfileList = None):
+        '''initialize device profile.'''
+        self._prefix = prefix
+        self._location = location
+        self._manufacturer = manufacturer
+        self._category = category
+        self._type =  type_
+        self._model = model
+        self._serialNumber = serialNumber
+        if serviceProfileList is None:
+            self._serviceProfileList = []
+        else:
+            self._serviceProfileList = serviceProfileList
+        self._metadata = ['prefix', 'location', 'manufacturer', 'category', 'type', 'model', 'serialNumber', 'serviceProfileList']
+ 
+    def __str__(self):
+        info ='prefix: '+ self._prefix + '\nlocation: '+ self._location + '\nmanufacturer: ' + self._manufacturer + '\ncategory: ' + self._category + '\ntype: ' + self._type + '\nserial number: ' + self._serialNumber + '\nservice profile list: '
+        info += ', '.join(self._serviceProfileList)
+        info += '\nmetadata: ' 
+        info += ', '.join(self._metadata)
+        return info
+    
+    def getPrefix(self):
+        '''get device prefix from profile'''
+        return self._prefix
+
+    def getLocation(self):
+        '''get device location from profile'''
+        return self._location
+
+    def getManufacturer(self):
+        '''get device manufacturer from profile'''
+        return self._manufacturer
+
+    def getCategory(self):
+        '''get device category from profile'''
+        return self._category
+
+    def getType(self):
+        '''get device type from profile'''
+        return self._type
+   
+    def getModel(self):
+        '''get device model from profile'''
+        return self._model
+
+    def getSerialNumber(self):
+        '''get device serial number from profile'''
+        return self._serialNumber
+
+    def getServiceProfileList(self):
+        '''get the service profile list that the device support'''
+        return self._serviceProfileList
+  
+    def getMetadata(self):
+        '''get metadata from profile'''
+        return self._metadata
+
+    def setPrefix(self, prefix):
+        '''set device prefix from profile'''
+        self._prefix = prefix
+
+    def setLocation(self, location):
+        '''set device location from profile'''
+        self._location = location
+
+    def setManufacturer(self, manufacturer):
+        '''set device manufacturer from profile'''
+        self._manufacturer = manufacturer
+
+    def setCategory(self, category):
+        '''set device category from profile'''
+        self._category = category
+
+    def setType(self, type_):
+        '''set device type from profile'''
+        self._type = type_
+
+    def setModel(self, model):
+        '''set device model from profile'''
+        self._model = model
+
+    def setSerialNumber(self, serialNumber):
+        '''set device serial number from profile'''
+        self._serialNumber = serialNumber
+
+    def setServiceProfile(self, serviceProfileList):
+        '''set the service profile list that the device support'''
+        self._serviceProfileList = serviceProfileList
+
+    def addServiceProfile(self, newServiceProfile):
+        '''
+        add one or several service profiles to the service profile list.
+        :param str/list _serviceProfile: a service profile or several profiles in the form of a list
+        '''
+        if isinstance(newServiceProfile, str):
+            self._serviceProfileList.append(newServiceProfile)
+        elif type(newServiceProfile) is list:
+            self._serviceProfileList += newServiceProfile
+
+    def addMetadata(self, newMetadata):
+        '''
+        add device one or several attributes to metadata.
+        :param str/list _newMetadata: new attributes to be added
+        '''
+        if isinstance(newMetadata, str):
+            self._metadata.append(newMetadata)
+        elif type(newMetadata) is list:
+            self._metadata += newMetadata 
diff --git a/tests/test_device_profile.py b/tests/test_device_profile.py
new file mode 100644
index 0000000..52986ce
--- /dev/null
+++ b/tests/test_device_profile.py
@@ -0,0 +1,73 @@
+from device_profile import DeviceProfile
+
+def readProfile(profile):
+    print '   prefix: ', profile.getPrefix()
+    print '   location: ', profile.getLocation()
+    print '   manufacturer: ', profile.getManufacturer()
+    print '   category: ', profile.getCategory()
+    print '   type: ', profile.getType()
+    print '   serial number: ', profile.getSerialNumber()
+    print '   service profile list:', profile.getServiceProfileList()
+    print '   metadata', profile.getMetadata()
+
+def test():
+    print 'starting to test device_profile.py'
+    print "initilize with category ='sensors', serialNumer = 'T9000000'..."
+    profile = DeviceProfile(category = 'sensors', serialNumber = 'T9000000')
+
+    print 'read profile...'
+    readProfile(profile)
+    
+    print "set prefix to '/home/sensor/LED/23'..."
+    profile.setPrefix('/home/sensor/LED/23')
+
+    print "set location to 'Alice's bedroom'..."
+    profile.setLocation('Alice\'s bedroom')
+   
+    print "set manufacturer to 'Intel'..."
+    profile.setManufacturer('Intel')
+
+    print "set type to 'LED'..."
+    profile.setType('LED')
+  
+    print "set serial number to 'T9273659'..."
+    profile.setSerialNumber('T9273659')
+
+    print "add a service profile '/standard/sensor/simple-LED-control/v0'..."
+    profile.addServiceProfile('/standard/sensor/simple-LED-control/v0')
+
+    print 'read profile...'
+    readProfile(profile)   
+
+    print "add sevice profiles ['/standard/sensor/simple-camera-control/v0', '/standard/sensor/simple-motionsensor-control/v0']..."
+    profile.addServiceProfile(['/standard/sensor/simple-camera-control/v0', '/standard/sensor/simple-motionsensor-control/v0'])
+    
+    print 'read profile...'
+    readProfile(profile)
+
+    print "set service profile to ['/standard/sensor/simple-camera-control/v0']... "
+    profile.setServiceProfile(['/standard/sensor/simple-camera-control/v0'])
+
+    print 'read profile...'
+    readProfile(profile)
+
+    print "add metadata 'name'... "
+    profile.addMetadata('name')
+
+    print 'read profile...'
+    readProfile(profile)
+ 
+    print "add metadata ['status', 'id']"
+    profile.addMetadata(['status', 'id'])
+
+    print 'read profile...'
+    readProfile(profile)
+    
+    print "test 'print profile'..."
+    print profile
+    
+    print "Unit tests: passed"
+
+if __name__ =='__main__':
+    test()
+