diff --git a/src/tuxedo_io/tuxedo_io.c b/src/tuxedo_io/tuxedo_io.c
index 3a532d6..94e5625 100644
--- a/src/tuxedo_io/tuxedo_io.c
+++ b/src/tuxedo_io/tuxedo_io.c
@@ -96,13 +96,13 @@ static int *tdp_max_defs = NULL;
 
 void uw_id_tdp(void)
 {
-	if (uw_feats->model == 0x13) {
+	if (uw_feats->model == UW_MODEL_PH4TUX) {
 		tdp_min_defs = tdp_min_ph4tux;
 		tdp_max_defs = tdp_max_ph4tux;
-	} else if (uw_feats->model == 0x12) {
+	} else if (uw_feats->model == UW_MODEL_PH4TRX) {
 		tdp_min_defs = tdp_min_ph4trx;
 		tdp_max_defs = tdp_max_ph4trx;
-	} else if (dmi_string_in(DMI_PRODUCT_SERIAL, "PH4TQX")) {
+	} else if (uw_feats->model == UW_MODEL_PH4TQF) {
 		tdp_min_defs = tdp_min_ph4tqx;
 		tdp_max_defs = tdp_max_ph4tqx;
 	} else if (dmi_match(DMI_PRODUCT_SKU, "POLARIS1XA02")) {
diff --git a/src/uniwill_interfaces.h b/src/uniwill_interfaces.h
index b7f29f1..fbc1d71 100644
--- a/src/uniwill_interfaces.h
+++ b/src/uniwill_interfaces.h
@@ -46,6 +46,10 @@ struct uniwill_interface_t {
 	uniwill_write_ec_ram_t *write_ec_ram;
 };
 
+#define UW_MODEL_PH4TUX		0x13
+#define UW_MODEL_PH4TRX		0x12
+#define UW_MODEL_PH4TQF		0x14
+
 struct uniwill_device_features_t {
 	u8 model;
 	/**