diff --git a/src/lib/drivers/pn531_usb.c b/src/lib/drivers/pn531_usb.c
index 5f3c1cb..abcb94e 100644
--- a/src/lib/drivers/pn531_usb.c
+++ b/src/lib/drivers/pn531_usb.c
@@ -51,27 +51,10 @@ nfc_device_desc_t * pn531_usb_pick_device (void)
 
 bool pn531_usb_list_devices(nfc_device_desc_t pnddDevices[], size_t szDevices, size_t *pszDeviceFound)
 {
-  int idvendor = 0x04CC;
-  int idproduct = 0x0531;
-  int idvendor_alt = 0x054c;
-  int idproduct_alt = 0x0193;
+  // array of {vendor,product} pairs for USB devices
+  usb_candidate_t candidates[]= {{0x04CC,0x0531},{0x054c,0x0193}};
 
-  size_t firstpass = 0;
-  
-  pn53x_usb_list_devices(&pnddDevices[0], szDevices, pszDeviceFound, idvendor, idproduct, PN531_USB_DRIVER_NAME);
-  if(*pszDeviceFound == szDevices)
-  {
-    DBG("Found %d devices",*pszDeviceFound);
-    return true;
-  }
-  firstpass= *pszDeviceFound;
-  pn53x_usb_list_devices(&pnddDevices[firstpass], szDevices - firstpass, pszDeviceFound, idvendor_alt, idproduct_alt, PN531_USB_DRIVER_NAME);
-  (*pszDeviceFound) += firstpass;
-
-  DBG("Found %d devices",*pszDeviceFound);
-  if(*pszDeviceFound) 
-    return true;
-  return false;
+  return pn53x_usb_list_devices(&pnddDevices[0], szDevices, pszDeviceFound, &candidates[0], sizeof(candidates) / sizeof(usb_candidate_t),PN531_USB_DRIVER_NAME);
 }
 
 nfc_device_t* pn531_usb_connect(const nfc_device_desc_t* pndd)
diff --git a/src/lib/drivers/pn533_usb.c b/src/lib/drivers/pn533_usb.c
index 93eaea6..de60ee7 100644
--- a/src/lib/drivers/pn533_usb.c
+++ b/src/lib/drivers/pn533_usb.c
@@ -51,27 +51,10 @@ nfc_device_desc_t * pn533_usb_pick_device (void)
 
 bool pn533_usb_list_devices(nfc_device_desc_t pnddDevices[], size_t szDevices, size_t *pszDeviceFound)
 {
-  int idvendor = 0x04cc;
-  int idproduct = 0x2533;
-  int idvendor_alt = 0x04e6;
-  int idproduct_alt = 0x5591;
+  // array of {vendor,product} pairs for USB devices
+  usb_candidate_t candidates[]= {{0x04CC,0x2533},{0x04E6,0x5591}};
 
-  size_t firstpass = 0;
-  
-  pn53x_usb_list_devices(&pnddDevices[0], szDevices, pszDeviceFound, idvendor, idproduct, PN533_USB_DRIVER_NAME);
-  if(*pszDeviceFound == szDevices)
-  {
-    DBG("Found %d devices",*pszDeviceFound);
-    return true;
-  }
-  firstpass= *pszDeviceFound;
-  pn53x_usb_list_devices(&pnddDevices[firstpass], szDevices - firstpass, pszDeviceFound, idvendor_alt, idproduct_alt, PN533_USB_DRIVER_NAME);
-  (*pszDeviceFound) += firstpass;
-
-  DBG("Found %d devices",*pszDeviceFound);
-  if(*pszDeviceFound) 
-    return true;
-  return false;
+  return pn53x_usb_list_devices(&pnddDevices[0], szDevices, pszDeviceFound, &candidates[0], sizeof(candidates) / sizeof(usb_candidate_t),PN533_USB_DRIVER_NAME);
 }
 
 nfc_device_t* pn533_usb_connect(const nfc_device_desc_t* pndd)
diff --git a/src/lib/drivers/pn53x_usb.c b/src/lib/drivers/pn53x_usb.c
index 99ddc8a..2e1aa64 100644
--- a/src/lib/drivers/pn53x_usb.c
+++ b/src/lib/drivers/pn53x_usb.c
@@ -70,15 +70,14 @@ void get_end_points(struct usb_device *dev, usb_spec_t* pus)
   }
 }
 
-bool pn53x_usb_list_devices(nfc_device_desc_t pnddDevices[], size_t szDevices, size_t *pszDeviceFound,int idvendor, int idproduct, char * target_name)
+bool pn53x_usb_list_devices(nfc_device_desc_t pnddDevices[], size_t szDevices, size_t *pszDeviceFound,usb_candidate_t candidates[], int num_candidates, char * target_name)
 {
-  int ret;
+  int ret, i;
   
   struct usb_bus *bus;
   struct usb_device *dev;
   uint32_t uiBusIndex = 0;
 
-  DBG("Looking for %s device (%04x:%04x)",target_name,idvendor,idproduct);
   usb_init();
 
   if ((ret= usb_find_busses() < 0)) return NULL;
@@ -92,30 +91,36 @@ bool pn53x_usb_list_devices(nfc_device_desc_t pnddDevices[], size_t szDevices, s
   {
     for (dev = bus->devices; dev; dev = dev->next, uiBusIndex++)
     {
-      DBG("Checking device %04x:%04x",dev->descriptor.idVendor,dev->descriptor.idProduct);
-      if (idvendor==dev->descriptor.idVendor && idproduct==dev->descriptor.idProduct)
+      for(i = 0; i < num_candidates; ++i)
       {
-        // Make sure there are 2 endpoints available
-        // with libusb-win32 we got some null pointers so be robust before looking at endpoints:
-        if (dev->config == NULL || dev->config->interface == NULL || dev->config->interface->altsetting == NULL)
+        DBG("Checking device %04x:%04x (%04x:%04x)",dev->descriptor.idVendor,dev->descriptor.idProduct,candidates[i].idVendor,candidates[i].idProduct);
+        if (candidates[i].idVendor==dev->descriptor.idVendor && candidates[i].idProduct==dev->descriptor.idProduct)
         {
-          // Nope, we maybe want the next one, let's try to find another
-          continue;
+          // Make sure there are 2 endpoints available
+          // with libusb-win32 we got some null pointers so be robust before looking at endpoints:
+          if (dev->config == NULL || dev->config->interface == NULL || dev->config->interface->altsetting == NULL)
+          {
+            // Nope, we maybe want the next one, let's try to find another
+            continue;
+          }
+          if (dev->config->interface->altsetting->bNumEndpoints < 2)
+          {
+            // Nope, we maybe want the next one, let's try to find another
+            continue;
+          }
+          strcpy(pnddDevices[*pszDeviceFound].acDevice, target_name);
+          pnddDevices[*pszDeviceFound].pcDriver = target_name;
+          pnddDevices[*pszDeviceFound].uiBusIndex = uiBusIndex;
+          (*pszDeviceFound)++;
+          DBG("%s","Match!");
+          // Test if we reach the maximum "wanted" devices
+          if((*pszDeviceFound) == szDevices) 
+          {
+            DBG("Found %d devices",*pszDeviceFound);
+            return true;
+          }
         }
-        if (dev->config->interface->altsetting->bNumEndpoints < 2)
-        {
-          // Nope, we maybe want the next one, let's try to find another
-          continue;
-        }
-        strcpy(pnddDevices[*pszDeviceFound].acDevice, target_name);
-        pnddDevices[*pszDeviceFound].pcDriver = target_name;
-        pnddDevices[*pszDeviceFound].uiBusIndex = uiBusIndex;
-        (*pszDeviceFound)++;
-        DBG("%s","Match!");
-        // Test if we reach the maximum "wanted" devices
-        if((*pszDeviceFound) == szDevices) break;
       }
-    if((*pszDeviceFound) == szDevices) break;
     }
   }
   DBG("Found %d devices",*pszDeviceFound);
@@ -126,8 +131,6 @@ bool pn53x_usb_list_devices(nfc_device_desc_t pnddDevices[], size_t szDevices, s
 
 nfc_device_t* pn53x_usb_connect(const nfc_device_desc_t* pndd, char * target_name, int target_chip)
 {
-  int ret;
-  
   nfc_device_t* pnd = NULL;
   usb_spec_t* pus;
   usb_spec_t us;
@@ -193,6 +196,7 @@ nfc_device_t* pn53x_usb_connect(const nfc_device_desc_t* pndd, char * target_nam
     }
   }
   // We ran out of devices before the index required
+  DBG("%s","Device index not found!");
   return NULL;
 }
 
diff --git a/src/lib/drivers/pn53x_usb.h b/src/lib/drivers/pn53x_usb.h
index 0f2a8e3..f7b21d4 100644
--- a/src/lib/drivers/pn53x_usb.h
+++ b/src/lib/drivers/pn53x_usb.h
@@ -33,8 +33,13 @@ typedef struct {
   uint32_t uiEndPointOut;
 } usb_spec_t;
 
+typedef struct {
+  u_int16_t idVendor;
+  u_int16_t idProduct;
+} usb_candidate_t;
+
 nfc_device_t* pn53x_usb_connect(const nfc_device_desc_t* pndd, char * target_name, int target_chip);
 void get_end_points(struct usb_device *dev, usb_spec_t* pus);
 void pn53x_usb_disconnect(nfc_device_t* pnd);
 bool pn53x_usb_transceive(const nfc_device_spec_t nds, const byte_t* pbtTx, const size_t szTxLen, byte_t* pbtRx, size_t* pszRxLen);
-bool pn53x_usb_list_devices(nfc_device_desc_t pnddDevices[], size_t szDevices, size_t *pszDeviceFound,int idvendor, int idproduct, char * target_name);
+bool pn53x_usb_list_devices(nfc_device_desc_t pnddDevices[], size_t szDevices, size_t *pszDeviceFound,usb_candidate_t candidates[], int num_candidates, char * target_name);