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# Reference

Tasmota backgound information.

## Supported Smart Switch with Energy Monitoring GPIO usage
Module | GPIO00 | GPIO01 | GPIO02 | GPIO03 | GPIO04 | GPIO05 | GPIO12 | GPIO13 | GPIO14 | GPIO15
-------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------
Sonoff Pow  | KEY1  |  -  |  -  |  -  |  -  |  NRG_SEL  |  REL1  |  NRG_CF1  |  HLW_CF  |  LED1
Sonoff Pow R2 |  KEY1  |  RXD  |  -  |  TXD  |  -  |  -  |  REL1  |  LED1_INV  |  -  |  -
Shelly 2  |  -  |  RXD  |  -  |  TXD  |  REL1  |  REL2  |  SWT1  |  -  |  SWT2  |  -
Huafan SS  |  LED1_INV  |  -  |  -  |  LED2_INV  |  KEY1  |  REL1_INV  |  NRG_CF1  |  NRG_SEL  |  HLW_CF  |  -
KMC 70011  |  KEY1  |  -  |  -  |  -  |  HLW_CF  |  NRG_CF1  |  NRG_SEL  |  LED1_INV  |  REL1  |  -
Teckin  |  -  |  KEY1  |  -  |  LED2_INV  |  HJL_CF  |  NRG_CF1  |  NRG_SEL_INV  |  LED1_INV  |  REL1  |  -
AplicWDP303075  |  -  |  -  |  -  |  KEY1  |  HLW_CF  |  NRG_CF1  |  NRG_SEL_INV  |  LED1_INV  |  REL1  |  -
Gosund SP1 v23  |  -  |  LED1_INV  |  -  |  KEY1  |  HJL_CF  |  NRG_CF1  |  NRG_SEL_INV  |  LED2_INV  |  REL1  |  -
SK03 Outdoor  |  KEY1  |  -  |  -  |  -  |  HLW_CF  |  NRG_CF1  |  NRG_SEL_INV  |  LED2_INV  |  LED1_INV  |  REL1
BlitzWolf SHP  |  LED2_INV  |  -  |  LED1_INV  |  -  |  -  |  HJL_CF  |  NRG_SEL_INV  |  KEY1  |  NRG_CF1  |  REL1
Teckin US |  LED2_INV |  - |  LED1_INV |  - |  REL1 |  HJL_CF |  NRG_SEL_INV |  KEY1 |  NRG_CF1 |  -
