diff --git a/protocol.h b/protocol.h
index ab47f7b..87394b5 100644
--- a/protocol.h
+++ b/protocol.h
@@ -19,6 +19,7 @@ typedef enum {
   kproto_cmd_set_state           = 1,  // set_state
   kproto_cmd_reset               = 2,  //
   kproto_cmd_setlong_key_delayms = 3,  //
+  kproto_cmd_read_power          = 4,  //
 
   kproto_cmd_ble_master_start_scan = 50,  // process by ble master ble_master_start_scan
   kproto_cmd_ble_master_enter_dfu  = 51,  // process by ble master ble_master_enter_dfu
@@ -86,6 +87,11 @@ typedef struct {
     struct {
       int32_t ecode;
     } errreceipt;
+
+    struct {
+      int32_t power;
+    }read_power;
+    
   } data;
 } hand_acid_ble_proto_t;
 #pragma pack()