User's Manual
ESP8266UserManual
6 / 12Espressif SystemsJune 19, 2014
radiatorshallcautiontheuserthatchangesormodificationsnotexpresslyapproved
by the party responsible for compliance could void the user's authority to operate
the equipment. In cases where the manual is provided only in a form other than
paper,suchasonacomputerdiskorovertheInternet,theinformationrequiredby
this section may be included in the manual in that alternative form, provided the
usercanreasonablybeexpectedtohavethecapabilitytoaccessinformationinthat
form.
This device complies with part 15 of the FCC Rules. Operation is subject to the
followingtwoconditions:(1)Thisdevicemaynotcauseharmfulinterference,and(2)
this device must accept any interference received, including interference that may
causeundesiredoperation.
Caution:Changesormodificationsnotexpresslyapprovedbythe manufacturer
couldvoidtheuser’sauthoritytooperatetheequipment.
2.1.3. FCC RF exposure requirements
1.Radiatedtransmitpowermustbeequaltoorlowerthanthatspecifiedinthe
FCCGrantofEquipmentAuthorizationforFCCID:2AC7Z‐ESP8266EX.
2.TocomplywithFCCregulationslimitingbothmaximumRFoutputpowerand
humanexposuretoRFradiation,maximumantennagain(includingcableloss)must
not
exceed:
❒ 802.11bband<2.0dBi
❒802.11gband<2.0dBi
❒802.11nband<2.0dBi
3. This module must not transmit simultaneously with any other antenna or
transmitter.
4. To ensure compliance with all non‐transmitter functions the host
manufacturer is responsible for ensuring compliance with the
module(s) installed
and fully operational. For example, if a host was previously authorized as an
unintentional radiator under the Declaration of Conformity procedure without a
transmitter certified module and a module is added, the host manufacturer is