diff --git a/pxtblocks/plugins/math/fieldSlider.ts b/pxtblocks/plugins/math/fieldSlider.ts
index 69860a1d4b36..1b634166c334 100644
--- a/pxtblocks/plugins/math/fieldSlider.ts
+++ b/pxtblocks/plugins/math/fieldSlider.ts
@@ -167,6 +167,11 @@ export class FieldSlider extends Blockly.FieldNumber {
                 Blockly.hideChaff();
                 break;
             }
+            case "ArrowDown": {
+                e.preventDefault();
+                e.stopPropagation();
+                break;
+            }
         }
     }
 
@@ -181,6 +186,10 @@ export class FieldSlider extends Blockly.FieldNumber {
         // editor on mobile devices.
         super.showEditor_(_e, true);
 
+        if (typeof this.min_ === "number" && typeof this.max_ === "number") {
+            this.htmlInput_.ariaLabel = lf("Enter a value between {0} and {1}", this.min_, this.max_);
+        }
+
         Blockly.DropDownDiv.hideWithoutAnimation();
         Blockly.DropDownDiv.clearContent();
         Blockly.DropDownDiv.getContentDiv().style.height = "";