diff --git a/tasmota/my_user_config.h b/tasmota/my_user_config.h
index 6a4f6df4d..38b99d4de 100644
--- a/tasmota/my_user_config.h
+++ b/tasmota/my_user_config.h
@@ -724,6 +724,7 @@
 // -- Serial sensors ------------------------------
 //#define USE_MHZ19                                // Add support for MH-Z19 CO2 sensor (+2k code)
 //#define USE_SENSEAIR                             // Add support for SenseAir K30, K70 and S8 CO2 sensor (+2k3 code)
+//#define USE_CM110x                                // Add support for CM110x CO2 sensors (+2k7code)
   #define CO2_LOW              800               // Below this CO2 value show green light (needs PWM or WS2812 RG(B) led and enable with SetOption18 1)
   #define CO2_HIGH             1200              // Above this CO2 value show red light (needs PWM or WS2812 RG(B) led and enable with SetOption18 1)
 //#define USE_PMS5003                              // Add support for PMS5003 and PMS7003 particle concentration sensor (+1k3 code)
diff --git a/tasmota/tasmota_configurations_ESP32.h b/tasmota/tasmota_configurations_ESP32.h
index bdcfcee65..16c7fc488 100644
--- a/tasmota/tasmota_configurations_ESP32.h
+++ b/tasmota/tasmota_configurations_ESP32.h
@@ -340,6 +340,7 @@
 
 //#define USE_MHZ19                                // Add support for MH-Z19 CO2 sensor (+2k code)
 //#define USE_SENSEAIR                             // Add support for SenseAir K30, K70 and S8 CO2 sensor (+2k3 code)
+//#define USE_CM110x                               // Add support for CM110x CO2 sensors (+2k7 code)
 #ifndef CO2_LOW
   #define CO2_LOW              800               // Below this CO2 value show green light (needs PWM or WS2812 RG(B) led and enable with SetOption18 1)
 #endif
@@ -476,6 +477,7 @@
 
 #define USE_MHZ19                                // Add support for MH-Z19 CO2 sensor (+2k code)
 #define USE_SENSEAIR                             // Add support for SenseAir K30, K70 and S8 CO2 sensor (+2k3 code)
+#define USE_CM110x                               // Add support for CM110x CO2 sensors (+2k7 code)
 #ifndef CO2_LOW
   #define CO2_LOW              800               // Below this CO2 value show green light (needs PWM or WS2812 RG(B) led and enable with SetOption18 1)
 #endif
diff --git a/tasmota/tasmota_template_legacy.h b/tasmota/tasmota_template_legacy.h
index 40b5fd228..31982e511 100644
--- a/tasmota/tasmota_template_legacy.h
+++ b/tasmota/tasmota_template_legacy.h
@@ -87,8 +87,8 @@ enum LegacyUserSelectablePins {
   GPI8_LED4_INV,
   GPI8_MHZ_TXD,        // MH-Z19 Serial interface
   GPI8_MHZ_RXD,        // MH-Z19 Serial interface
-  GPI8_CM11_TXD,        // CM110x Serial interface
-  GPI8_CM11_RXD,        // CM110x Serial interface
+  GPI8_CM11_TXD,       // CM110x Serial interface
+  GPI8_CM11_RXD,       // CM110x Serial interface
   GPI8_PZEM0XX_TX,     // PZEM0XX Serial interface
   GPI8_PZEM004_RX,     // PZEM004T Serial interface
   GPI8_SAIR_TX,        // SenseAir Serial interface
diff --git a/tasmota/xsns_95_cm110x.ino b/tasmota/xsns_95_cm110x.ino
index d7c1e75d4..17c090c10 100644
--- a/tasmota/xsns_95_cm110x.ino
+++ b/tasmota/xsns_95_cm110x.ino
@@ -215,8 +215,8 @@ void CM11EverySecond(void)
     while (((millis() - start) < CM1107_READ_TIMEOUT) && (counter < resp_len)) {
       if (CM11Serial->available() > 0) {
         cm11_response[counter++] = CM11Serial->read();
-        if (counter ==2 && cm11_response[0] == 0x16) {
-          resp_len = cm11_response[1] +3 ;
+        if (counter ==2 && cm11_response[0] == 0x16) { //0x16 - first byte in response
+          resp_len = cm11_response[1] +3 ; // Get expected response len (according protocol desc), +3 - first byte, len and checksum
         }
       } else {
         delay(5);