diff --git a/src/uwatec_aladin.c b/src/uwatec_aladin.c
index 298a22b..116b921 100644
--- a/src/uwatec_aladin.c
+++ b/src/uwatec_aladin.c
@@ -52,13 +52,14 @@ struct uwatec_aladin_device_t {
 	unsigned int timestamp;
 };
 
+static device_status_t uwatec_aladin_device_set_fingerprint (device_t *abstract, const unsigned char data[], unsigned int size);
 static device_status_t uwatec_aladin_device_dump (device_t *abstract, unsigned char data[], unsigned int size, unsigned int *result);
 static device_status_t uwatec_aladin_device_foreach (device_t *abstract, dive_callback_t callback, void *userdata);
 static device_status_t uwatec_aladin_device_close (device_t *abstract);
 
 static const device_backend_t uwatec_aladin_device_backend = {
 	DEVICE_TYPE_UWATEC_ALADIN,
-	NULL, /* set_fingerprint */
+	uwatec_aladin_device_set_fingerprint, /* set_fingerprint */
 	NULL, /* handshake */
 	NULL, /* version */
 	NULL, /* read */
@@ -173,6 +174,26 @@ uwatec_aladin_device_set_timestamp (device_t *abstract, unsigned int timestamp)
 }
 
 
+static device_status_t
+uwatec_aladin_device_set_fingerprint (device_t *abstract, const unsigned char data[], unsigned int size)
+{
+	uwatec_aladin_device_t *device = (uwatec_aladin_device_t*) abstract;
+
+	if (! device_is_uwatec_aladin (abstract))
+		return DEVICE_STATUS_TYPE_MISMATCH;
+
+	if (size && size != 4)
+		return DEVICE_STATUS_ERROR;
+
+	if (size)
+		device->timestamp = data[0] + (data[1] << 8) + (data[2] << 16) + (data[3] << 24);
+	else
+		device->timestamp = 0;
+
+	return DEVICE_STATUS_SUCCESS;
+}
+
+
 static device_status_t
 uwatec_aladin_device_dump (device_t *abstract, unsigned char data[], unsigned int size, unsigned int *result)
 {
diff --git a/src/uwatec_memomouse.c b/src/uwatec_memomouse.c
index d0b47d4..233888b 100644
--- a/src/uwatec_memomouse.c
+++ b/src/uwatec_memomouse.c
@@ -51,13 +51,14 @@ struct uwatec_memomouse_device_t {
 	unsigned int timestamp;
 };
 
+static device_status_t uwatec_memomouse_device_set_fingerprint (device_t *device, const unsigned char data[], unsigned int size);
 static device_status_t uwatec_memomouse_device_dump (device_t *abstract, unsigned char data[], unsigned int size, unsigned int *result);
 static device_status_t uwatec_memomouse_device_foreach (device_t *abstract, dive_callback_t callback, void *userdata);
 static device_status_t uwatec_memomouse_device_close (device_t *abstract);
 
 static const device_backend_t uwatec_memomouse_device_backend = {
 	DEVICE_TYPE_UWATEC_MEMOMOUSE,
-	NULL, /* set_fingerprint */
+	uwatec_memomouse_device_set_fingerprint, /* set_fingerprint */
 	NULL, /* handshake */
 	NULL, /* version */
 	NULL, /* read */
@@ -176,6 +177,26 @@ uwatec_memomouse_device_set_timestamp (device_t *abstract, unsigned int timestam
 }
 
 
+static device_status_t
+uwatec_memomouse_device_set_fingerprint (device_t *abstract, const unsigned char data[], unsigned int size)
+{
+	uwatec_memomouse_device_t *device = (uwatec_memomouse_device_t*) abstract;
+
+	if (! device_is_uwatec_memomouse (abstract))
+		return DEVICE_STATUS_TYPE_MISMATCH;
+
+	if (size && size != 4)
+		return DEVICE_STATUS_ERROR;
+
+	if (size)
+		device->timestamp = data[0] + (data[1] << 8) + (data[2] << 16) + (data[3] << 24);
+	else
+		device->timestamp = 0;
+
+	return DEVICE_STATUS_SUCCESS;
+}
+
+
 static device_status_t
 uwatec_memomouse_confirm (uwatec_memomouse_device_t *device, unsigned char value)
 {
diff --git a/src/uwatec_smart.c b/src/uwatec_smart.c
index 15638f7..f476ea0 100644
--- a/src/uwatec_smart.c
+++ b/src/uwatec_smart.c
@@ -48,13 +48,14 @@ struct uwatec_smart_device_t {
 	unsigned int timestamp;
 };
 
+static device_status_t uwatec_smart_device_set_fingerprint (device_t *device, const unsigned char data[], unsigned int size);
 static device_status_t uwatec_smart_device_dump (device_t *abstract, unsigned char data[], unsigned int size, unsigned int *result);
 static device_status_t uwatec_smart_device_foreach (device_t *abstract, dive_callback_t callback, void *userdata);
 static device_status_t uwatec_smart_device_close (device_t *abstract);
 
 static const device_backend_t uwatec_smart_device_backend = {
 	DEVICE_TYPE_UWATEC_SMART,
-	NULL, /* set_fingerprint */
+	uwatec_smart_device_set_fingerprint, /* set_fingerprint */
 	NULL, /* handshake */
 	NULL, /* version */
 	NULL, /* read */
@@ -203,6 +204,26 @@ uwatec_smart_device_set_timestamp (device_t *abstract, unsigned int timestamp)
 }
 
 
+static device_status_t
+uwatec_smart_device_set_fingerprint (device_t *abstract, const unsigned char data[], unsigned int size)
+{
+	uwatec_smart_device_t *device = (uwatec_smart_device_t*) abstract;
+
+	if (! device_is_uwatec_smart (abstract))
+		return DEVICE_STATUS_TYPE_MISMATCH;
+
+	if (size && size != 4)
+		return DEVICE_STATUS_ERROR;
+
+	if (size)
+		device->timestamp = data[0] + (data[1] << 8) + (data[2] << 16) + (data[3] << 24);
+	else
+		device->timestamp = 0;
+
+	return DEVICE_STATUS_SUCCESS;
+}
+
+
 static device_status_t
 uwatec_smart_transfer (uwatec_smart_device_t *device, const unsigned char command[], unsigned int csize, unsigned char answer[], unsigned int asize)
 {