diff --git a/lv_objx/lv_cb.c b/lv_objx/lv_cb.c
index e6fc49454..63a8005ce 100644
--- a/lv_objx/lv_cb.c
+++ b/lv_objx/lv_cb.c
@@ -120,9 +120,10 @@ lv_obj_t * lv_cb_create(lv_obj_t * par, const lv_obj_t * copy)
  *====================*/
 
 /**
- * Set the text of a check box
+ * Set the text of a check box. `txt` will be copied and may be deallocated
+ * after this function returns.
  * @param cb pointer to a check box
- * @param txt the text of the check box
+ * @param txt the text of the check box. NULL to refresh with the current text.
  */
 void lv_cb_set_text(lv_obj_t * cb, const char * txt)
 {
@@ -130,6 +131,17 @@ void lv_cb_set_text(lv_obj_t * cb, const char * txt)
     lv_label_set_text(ext->label, txt);
 }
 
+/**
+ * Set the text of a check box. `txt` must not be deallocated during the life
+ * of this checkbox.
+ * @param cb pointer to a check box
+ * @param txt the text of the check box. NULL to refresh with the current text.
+ */
+void lv_cb_set_static_text(lv_obj_t * cb, const char * txt) {
+    lv_cb_ext_t * ext = lv_obj_get_ext_attr(cb);
+    lv_label_set_static_text(ext->label, txt);
+}
+
 /**
  * Set a style of a check box
  * @param cb pointer to check box object
diff --git a/lv_objx/lv_cb.h b/lv_objx/lv_cb.h
index b58773341..45f33ee87 100644
--- a/lv_objx/lv_cb.h
+++ b/lv_objx/lv_cb.h
@@ -78,12 +78,21 @@ lv_obj_t * lv_cb_create(lv_obj_t * par, const lv_obj_t * copy);
  *====================*/
 
 /**
- * Set the text of a check box
+ * Set the text of a check box. `txt` will be copied and may be deallocated
+ * after this function returns.
  * @param cb pointer to a check box
- * @param txt the text of the check box
+ * @param txt the text of the check box. NULL to refresh with the current text.
  */
 void lv_cb_set_text(lv_obj_t * cb, const char * txt);
 
+/**
+ * Set the text of a check box. `txt` must not be deallocated during the life
+ * of this checkbox.
+ * @param cb pointer to a check box
+ * @param txt the text of the check box. NULL to refresh with the current text.
+ */
+void lv_cb_set_static_text(lv_obj_t * cb, const char * txt);
+
 /**
  * Set the state of the check box
  * @param cb pointer to a check box object
diff --git a/lv_objx/lv_kb.c b/lv_objx/lv_kb.c
index 01f654681..a5545bcfa 100644
--- a/lv_objx/lv_kb.c
+++ b/lv_objx/lv_kb.c
@@ -82,6 +82,7 @@ static const char * kb_map_num[] = {
 };
 
 static const lv_btnm_ctrl_t kb_ctrl_num_map[] = {
+     1, 1, 1, 2,
      1, 1, 1, 2,
      1, 1, 1, 2,
      1, 1, 1, 1, 1