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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>usb — requestDevice</title>
</head>
<body>
  <button id="pick" type="button">Select USB device</button>
  <pre id="out">Click the button to open the pairing flow (HTTPS + supporting browser).</pre>
  <script>
    var out = document.getElementById("out");
    document.getElementById("pick").addEventListener("click", async function () {
      if (!navigator.usb) {
        out.textContent = "WebUSB not supported.";
        return;
      }
      try {
        var filters = [
          { vendorId: 0x1209, productId: 0xa800 },
          { vendorId: 0x1209, productId: 0xa850 }
        ];
        var device = await navigator.usb.requestDevice({ filters: filters });
        out.textContent = "Selected: " + (device.productName || "USB device");
      } catch (e) {
        out.textContent =
          "No device selected or request blocked: " +
          (e && e.message ? e.message : e);
      }
    });
  </script>
</body>
</html>

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usb — requestDevice (Try It)