--- smusbutil.c
+++ smusbutil.c
@@ -23,6 +23,7 @@
 static void print_usage(void)
 {
   fprintf(stderr, "Usage: smusbutil clockrate mode\n\n");
+  fprintf(stderr, "  <0 | 1 | 2 | 3>  Select USB device\n");
   fprintf(stderr, "  <3580 | 3680 | 6000>     Set smartcard clock in kHz\n");
   fprintf(stderr, "  <phoenix | smartmouse>   Set operation mode\n");
   fprintf(stderr, "\n");
@@ -34,18 +35,38 @@
 {
   struct ftdi_context ftdic;
   int f,i,e;
+  int vendor=0x104f;
+  int reader;
   char buf[1];
   buf[0] = 0;
   e = 0;
   char frq, opmode; 
 
-  if (argc != 3)
+  if (argc != 4)
   {
     print_usage();
     exit(-1);
   }
 
   switch(atoi(argv[1]))  {
+    case 0:
+      reader = 0x0001;
+      break;
+    case 1:
+      reader = 0x0002;
+      break;
+    case 2:
+      reader = 0x0003;
+      break;
+    case 3:
+      reader = 0x0004;
+      break;
+    default:
+       print_usage();
+       exit(-1);
+  }
+
+  switch(atoi(argv[2]))  {
     case 3580:                     //3,58 = 10 = 2
       frq = 2;
       break;
@@ -62,12 +83,12 @@
 
   buf[0] |= frq<<4;
 
-  if(strcmp(argv[2], "smartmouse") == 0)  {
+  if(strcmp(argv[3], "smartmouse") == 0)  {
     buf[0] |= 1<<6;
     e = 1;
   }
 
-  if(strcmp(argv[2], "phoenix") == 0)  {
+  if(strcmp(argv[3], "phoenix") == 0)  {
     e = 1;
   }
 
@@ -78,9 +99,9 @@
 
   ftdi_init(&ftdic);
 
-  f = ftdi_usb_open(&ftdic, 0x104f, 0x0002); 
+  f = ftdi_usb_open(&ftdic, vendor, reader);
   if(f < 0 && f != -5) {
-    fprintf(stderr, "can't find any Smartmouse USB (VID:0x104f/PID:0x0002): %d\n",f);
+    fprintf(stderr, "can't find any Smartmouse USB (VID:%#x/PID:%#x)\n",vendor,reader);
     exit(-1);
   }
   printf("Smartmouse USB found: %d\n",f);
@@ -105,4 +126,6 @@
 
   ftdi_usb_close(&ftdic);
   ftdi_deinit(&ftdic);
+
+  exit(0);
 }