Marcus Mengs on Twitter: "New receiver for @Logitech R400 presentation clicker mitigates wireless keystroke injection. Had 5 minutes to test a replacement receiver. The new ones marked with 'ESW3601' restrict injectable keys
Logitech R400 Presenter Remote Control Black 910-001354 - Best Buy
Logitech R400 Wireless Presenter (910-001354)
Logitech Wireless Presenter R400 910-001354 B&H Photo Video