diff --git a/aux-etc-nixos/configuration.nix b/aux-etc-nixos/configuration.nix
index fb9ff2f..7b1c0d1 100644
--- a/aux-etc-nixos/configuration.nix
+++ b/aux-etc-nixos/configuration.nix
@@ -208,6 +208,12 @@ in
 
   services.backupdl.enable = true;
 
+  services.udev.extraRules =
+    ''
+    # label printer
+    SUBSYSTEM=="usb", ATTRS{idVendor}=="07cf", ATTRS{idProduct}=="4204", MODE="0660", GROUP="plugdev"
+    '';
+
   nix.settings.trusted-public-keys = ["nixbld.m-labs.hk-1:5aSRVA5b320xbNvu30tqxVPXpld73bhtOeH6uAjRyHc="];
   nix.settings.substituters = ["https://nixbld.m-labs.hk" "https://cache.nixos.org"];
   nix.settings.trusted-users = ["sb"];