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![!!Table!of!Contents!Revision!History!.....................................................................................................................................!2'Overview!and!Key!Features!................................................................................................................!4'F&";*#&-'11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111'A'Specification!............................................................................................................................................!5'GD&3.H.3";./)'G*??"#>'11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111'I'Hardware!Specifications!.....................................................................................................................!7'J+/3K':."=#"?-'111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111'B'GEMNFC!Overview!.................................................................................................................................!8'L9&#9.&%'111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111'6'G&#."+'!/-;'")$'D/%&#'3/))&3;/#'111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111'6'M/%&#'NO:'111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111'P'N.)K'NO:'1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111'P'M".#QNO:'3/))&3;/#'111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111'P'(/*);.)='4/+&-'111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111'P'EF<'R);&))"'</))&3;/#'111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111'P'Specifications!..........................................................................................................................................!9'LD&#";.)='M"#"?&;&#-'1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111'P'Operating!Modes!.................................................................................................................................!10'S>?T.;'</))&3;./)'11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111'02'G?"#;D4/)&'</))&3;./)'1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111'05'GEMNFC!Considerations!...................................................................................................................!15'R);&))"'<4"#"3;&#.-;.3-'1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111'0I'Mechanical!Information!...................................................................................................................!16':.?&)-./)-'U.)'??V'111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111'0W'Connecting!GEMNFC!to!Console!MCU!............................................................................................!16'GEMNFC!Host!Protocol!......................................................................................................................!16'NFC!Reader!T4T!card!mode!operation!........................................................................................!17'XGLQXO<'0AAAR'3"#$'?/$&'11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111'0B'XGLQXO<'0AAAYJ'3"#$'?/$&'111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111'06'Regulatory!&!Standards!Information!...........................................................................................!18'F<<'Z'X)$*-;#>'<")"$"'111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111'06'F&$&#"+'</??*).3";./)'</??.--./)'UF<<V'8"$.";./)'O[D/-*#&'G;";&?&);\''1111111111111111111'06'F<<'N"@&+.)='8&]*.#&?&);-'111111111111111111111111111111111111111111111111111111111111111111111111111111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'](https://usermanual.wiki/Wahoo-Fitness/WF127/User-Guide-3841326-Page-3.png)
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![>?@A2B(-#"+#$".(-#"+#$".(`4&'H/++/%.)='D.3;*#&'D#/9.$&-'")'/9&#9.&%'/H';4&'9"#./*-'4"#$%"#&'&+&?&);-'/H'SO(EF<'@/"#$1''''4"+$/:()&%*(/'0(5&."+(6&''"6*&+((`4&'G&#."+'!/-;'")$'D/%&#'3/))&3;/#'D#/9.$&-'"'?&")-';/'3/))&3;'"'-*DD+>'9/+;"=&'/H'I,';/';4&'SO(EF<'@/"#$'"-'%&++'"-'`#")-?.;'")$'8&3&.9&'+.)&-'H/#'-&#."+'3/??*).3";./)-'@&;%&&)';4&'SO(EF<'@/"#$'")$';4&'H.;)&--'&]*.D?&);'3/)-/+&'(<C1'`4&'SO(EF<'-&#."+'+.)&-'"#&'I,';/+&#");'")$'/D&#";&'";'00I15T@D-1'GEM2 ModuleMounting HolePower & PairLEDsPair Button &LEDSerial & Power ConnectionsMounting HoleNFCAntenna Connector](https://usermanual.wiki/Wahoo-Fitness/WF127/User-Guide-3841326-Page-8.png)
!['C&."+(D?<(`4&'=#&&)'D/%&#'NO:'.)$.3";&-'%4&)';4&'SO(EF<'.-'D/%&#&$1'D$';(D?<(`4&'/#")=&'+.)K'NO:'.)$.3";&-'%4&)';4&'SO(EF<'.-'"$9&#;.-.)='@>'@+.)K.)='";'"'0!h'#";&'")$'3/);.)*"++>'.++*?.)";&$'%4&)'"'J+*&;//;4'3/))&3;./)'4"-'@&&)'&-;"@+.-4&$1'C/$+ED?<(6&''"6*&+(`4&'M".#QNO:'3/))&3;/#'D#/9.$&-'H"3.+.;.&-'H/#'3/))&3;./)';/'&[;&#)"+'3.#3*.;#>'H/#';4&'M".#QR$9&#;.-.)='X)$.3";/#'SMXL'")$';4&'M".#'@*;;/)'SMXL'/H';4&'SO(EF<'?/$*+&1'`4.-'.);&#H"3&'.)3+*$&-'"',::'3/))&3;./)'D/.);'.)'"$$.;./)';/';4&'XQL'+.)&-'H/#';4&'D".#'@*;;/)'.)D*;'")$'NO:'/*;D*;'+.)&1'@&3'*$'=(F&:"%(`4&'SO(EF<'?/*);.)='4/+&-'D#/9.$&'"'3/)9&).&);'?&;4/$'/H'?/*);.)=';4&'SO(EF<'%.;4.)'H.;)&--'&]*.D?&);1''A2B(G'*"''/(B&''"6*&+(`4&'SO(EF<'");&))"'3/))&3;/#'D#/9.$&-'"'-.?D+&'?&;4/$'/H'3/))&3;.)=';4&'SO(EF<b-'EF<'");&))"';/';4&'SO(EF<'?/$*+&1''45"6$7$6/*$&'%(-5"+/*$'=(C/+/8"*"+%(M"#"?&;&#' (.)'`>D.3"+'("['G*DD+>',/+;"=&' d21Y,'I12,'aI16,'LD&#";.)='`&?D&#";*#&'f'Y1Y,' dA2<' ' a6I<'G&#."+'X);&#H"3&'[1['I12,'c1[''' '](https://usermanual.wiki/Wahoo-Fitness/WF127/User-Guide-3841326-Page-9.png)
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![((C-&#'@&=.)-'%/#K/*;1'SO(EF<'#&+">-'$";"'H#/?'H.;)&--'&]*.D?&);';/'^";34'*-.)='J+*&;//;4'H.;)&--'?"34.)&'-&#9.3&1'SO(EF<'#&3&.9&-'!8'")$'<"+/#.&'$";"'H#/?'^";34'*-.)='S>?TX;'-&#9.3&1''(48/+*5F&'"(B&''"6*$&'(`4&'SO(EF<'?/$*+&'%4&)'.);&=#";&$'.);/'"'H.;)&--'&]*.D?&);'$&9.3&'3")'D".#'%.;4'"'?/@.+&'$&9.3&'%.;4'"'3/?D";.@+&'"DD+.3";./)'-*34'"-'^"4//'8*)F.;'*-.)='J+*&;//;4'+/%'&)&#=>1''`4&'SO(EF<'?/$*+&'%.++'@#/"$3"-;'.;b-'D#&-&)3&';/';4&'?/@.+&'$&9.3&'")$';4#/*=4';4&'"DD+.3";./)b-'*-&#'.);&#H"3&7';4&'*-&#'3")'3/))&3;';4&.#'?/@.+&'$&9.3&';/';4&'H.;)&--'&]*.D?&);'/9&#'"'J+*&;//;4'+.)K1'`''`4&'H/++/%.)='$."=#"?-'/*;+.)&-';4&'/D&#";.)='H+/%'H/#'*-.)=';4&'SO(EF<'H/#'S>?T.;'RDD+.3";./)-\'NFC AntennaWorkout data displayHR & Caloriesfrom Watch](https://usermanual.wiki/Wahoo-Fitness/WF127/User-Guide-3841326-Page-12.png)
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