diff --git a/CHANGELOG.md b/CHANGELOG.md
index ff0985fd4..6e1c60b98 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,8 @@ This project uses the changelog in accordance with [keepchangelog](http://keepac
 
 ## [unreleased][unreleased]
 - Changed flash-stored key dictionaries (Mifare, iClass, T55XX) and T55XX configurations to SPIFFS files (@piotrva)
+- Changed `lf em 410x sim` to use default gap value of 0 and extended help (@piotrva)
+- Changed `hf 14a info` - now identifies MIAFRE Duox (@iceman1001)
 - Added `hf iclass trbl` to perform tear-off attacks on iClass (@antiklesys)
 - Added support for connection to host device in all Docker envs (@doegox)
 - Changed `hf 15 info` to show all type matches and check ST25TVxC signature (@doegox)
diff --git a/client/src/cmdhf14a.c b/client/src/cmdhf14a.c
index cd1db3e08..03e8585e1 100644
--- a/client/src/cmdhf14a.c
+++ b/client/src/cmdhf14a.c
@@ -1884,6 +1884,7 @@ static int detect_nxp_card_print(uint8_t sak, uint16_t atqa, uint64_t select_sta
                         printTag("MIFARE DESFire EV2 2K/4K/8K/16K/32K");
                         printTag("MIFARE DESFire EV3 2K/4K/8K");
                         printTag("MIFARE DESFire Light 640B");
+                        printTag("MIFARE Duox");
                         type |= MTDESFIRE;
                     } else {
                         printTag("MIFARE Plus EV1 2K/4K CL2 in SL3");
diff --git a/client/src/cmdhfmfdes.c b/client/src/cmdhfmfdes.c
index ee8b537c9..d0fcbf112 100644
--- a/client/src/cmdhfmfdes.c
+++ b/client/src/cmdhfmfdes.c
@@ -148,6 +148,7 @@ typedef enum {
     PLUS_EV2,
     NTAG413DNA,
     NTAG424,
+    DUOX,
 } nxp_cardtype_t;
 
 typedef enum {
@@ -272,6 +273,10 @@ static char *getVersionStr(uint8_t type, uint8_t major, uint8_t minor) {
         snprintf(retStr, sizeof(buf), "%x.%x ( " _GREEN_("Plus EV1") " )", major, minor);
     else if (type == 0x02 && major == 0x22 && minor == 0x00)
         snprintf(retStr, sizeof(buf), "%x.%x ( " _GREEN_("Plus EV2") " )", major, minor);
+    else if (type == 0x01 && major == 0xA0 && minor == 0x00)
+        snprintf(retStr, sizeof(buf), "%x.%x ( " _GREEN_("DUOX") " )", major, minor);
+    else if ((type & 0x08) == 0x08)
+        snprintf(retStr, sizeof(buf), "%x.%x ( " _GREEN_("DESFire Light") " )", major, minor);
     else
         snprintf(retStr, sizeof(buf), "%x.%x ( " _YELLOW_("Unknown") " )", major, minor);
     return buf;
@@ -338,6 +343,10 @@ static nxp_cardtype_t getCardType(uint8_t type, uint8_t major, uint8_t minor) {
     if (type == 0x01 && major == 0x33 && minor == 0x00)
         return DESFIRE_EV3;
 
+    // Duox
+    if (type == 0x01 && major == 0xA0 && minor == 0x00)
+        return DUOX;
+
     // DESFire Light
     if (type == 0x08 && major == 0x30 && minor == 0x00)
         return DESFIRE_LIGHT;
@@ -744,6 +753,8 @@ static int CmdHF14ADesInfo(const char *Cmd) {
         PrintAndLogEx(INFO, "\t2.2 - DESFire Ev2 XL, Originality check, proximity check, EAL5");
     if (major == 3 && minor == 0)
         PrintAndLogEx(INFO, "\t3.0 - DESFire Ev3, Originality check, proximity check, badass EAL6 ?");
+    if (major == 0xA0 && minor == 0)
+        PrintAndLogEx(INFO, "\tx.x - DUOX, Originality check, proximity check, EAL6++");
 
     if (major == 0 && minor == 2)
         PrintAndLogEx(INFO, "\t0.2 - DESFire Light, Originality check, ");
@@ -761,7 +772,8 @@ static int CmdHF14ADesInfo(const char *Cmd) {
     if (cardtype == DESFIRE_EV2 ||  cardtype == DESFIRE_EV2_XL ||
             cardtype == DESFIRE_LIGHT ||
             cardtype == DESFIRE_EV3 ||
-            cardtype == NTAG413DNA) {
+            cardtype == NTAG413DNA || 
+            cardtype == DUOX) {
         // Signature originality check
         uint8_t signature[250] = {0}; // must be 56
         size_t signature_len = 0;
diff --git a/client/src/cmdlfem410x.c b/client/src/cmdlfem410x.c
index 10ad41369..5abbbd4d3 100644
--- a/client/src/cmdlfem410x.c
+++ b/client/src/cmdlfem410x.c
@@ -449,17 +449,19 @@ static int CmdEM410xSim(const char *Cmd) {
     CLIParserContext *ctx;
     CLIParserInit(&ctx, "lf em 410x sim",
                   "Enables simulation of EM 410x card.\n"
-                  "Simulation runs until the button is pressed or another USB command is issued.",
+                  "Simulation runs until the button is pressed or another USB command is issued.\n"
+                  "Most common readers expects the code to be sent in loop without a break (i.e. --gap 0).\n"
+                  "For other, more advanced readers there might be a need to set a non-zero gap value.",
                   "lf em 410x sim --id 0F0368568B\n"
                   "lf em 410x sim --id 0F0368568B --clk 32\n"
-                  "lf em 410x sim --id 0F0368568B --gap 0"
+                  "lf em 410x sim --id 0F0368568B --gap 20"
                  );
 
     void *argtable[] = {
         arg_param_begin,
         arg_u64_0(NULL, "clk", "<dec>", "<32|64> clock (default 64)"),
         arg_str1(NULL, "id", "<hex>", "EM Tag ID number (5 hex bytes)"),
-        arg_u64_0(NULL, "gap", "<dec>", "gap (0's) between ID repeats (default 20)"),
+        arg_u64_0(NULL, "gap", "<dec>", "gap (0's) between ID repeats (default 0)"),
         arg_param_end
     };
     CLIExecWithReturn(ctx, Cmd, argtable, false);
@@ -467,7 +469,7 @@ static int CmdEM410xSim(const char *Cmd) {
     // clock is 64 in EM410x tags
     int clk = arg_get_u32_def(ctx, 1, 64);
     int uid_len = 0;
-    int gap = arg_get_u32_def(ctx, 3, 20);
+    int gap = arg_get_u32_def(ctx, 3, 0);
     uint8_t uid[5] = {0};
     CLIGetHexWithReturn(ctx, 2, uid, &uid_len);
     CLIParserFree(ctx);