diff --git a/lib/uuid.h b/lib/uuid.h
index 237145b..814fd92 100644
--- a/lib/uuid.h
+++ b/lib/uuid.h
@@ -118,6 +118,13 @@ extern "C" {
 #define GATT_CHARAC_RECONNECTION_ADDRESS		0x2A03
 #define GATT_CHARAC_PERIPHERAL_PREF_CONN		0x2A04
 #define GATT_CHARAC_SERVICE_CHANGED			0x2A05
+#define GATT_CHARAC_SYSTEM_ID				0x2A23
+#define GATT_CHARAC_MODEL_NUMBER_STRING			0x2A24
+#define GATT_CHARAC_SERIAL_NUMBER_STRING		0x2A25
+#define GATT_CHARAC_FIRMWARE_REVISION_STRING		0x2A26
+#define GATT_CHARAC_HARDWARE_REVISION_STRING		0x2A27
+#define GATT_CHARAC_SOFTWARE_REVISION_STRING		0x2A28
+#define GATT_CHARAC_MANUFACTURER_NAME_STRING		0x2A29
 
 /* GATT Characteristic Descriptors */
 #define GATT_CHARAC_EXT_PROPER_UUID			0x2900