diff --git a/index.html b/index.html
index 5c47b1c..da7fb0e 100644
--- a/index.html
+++ b/index.html
@@ -43,6 +43,8 @@
 
 
 <script>
+    const ZEBRA_VENDOR_ID = 0xA5F;
+
     function createHooks() {
         document.querySelector("button.browser-printer-print").addEventListener("click", async (e) => {
             const availableDevices = await getAvailablePrinters();
@@ -59,7 +61,7 @@
         });
 
         document.querySelector("button.web-api-print").addEventListener("click", async (e) => {
-            let device = await navigator.usb.requestDevice({ filters: [{ vendorId: 0xA5F }] });
+            const device = await navigator.usb.requestDevice({ filters: [{ vendorId: ZEBRA_VENDOR_ID }] });
             await device.open();
             await device.selectConfiguration(1);
             await device.claimInterface(0);
@@ -68,7 +70,7 @@
             const encoder = new TextEncoder();
             const data = encoder.encode(zpl);
 
-            const res = await device.transferOut(1, data);
+            await device.transferOut(1, data);
         })
     }