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Black Case with Black Button

Manual - 311 1 Button

Operating frequency :   

311 MHz

Number of buttons :    

1

Battery :             

1 ea. 12V A23

Operating temperature :   -20°F - 85°F
Overall dimensions :    

1-1/2 x 2-1/8 x 3/8 inch

Weight:  

1 oz.

2 - NUMBERING

1 - TRANSMITTER OVERVIEW

3 - PROGRAMMING
4 - OPERATION
5 - BATTERY ACCESS

6 - TROUBLESHOOTING

 FCC ID: SU7311DEK31K

Made in Taiwan.  Copywrite © 2016 DEK Canada Inc.

DEK Canada Inc. Firefly3

TM

 Type: FIR311DEK31K

DEK CANADA INC.

The warranty period of DEK Canada Inc. Firefly3™ transmitters is 

twenty-four (24) months.  This warranty shall begin on the date the 

transmitter is manufactured.  During the warranty period, the product will be 

repaired or replaced (at the sole discretion of DEK Canada Inc.) if the 

product does not operate correctly due to a defective component.  This 

warranty does not extend to (a) the transmitter case, which can be damaged 

by conditions outside the control of DEK Canada Inc., or (b) battery life of 

the transmitter.  This warranty is further limited by the following disclaimer of 

warranty and liability:

EXCEPT AS SET FORTH ABOVE, DEK CANADA INC. MAKES NO WARRANIES REGARDING THE GOODS, 
EXPRESS OR IMPLIED, INCLUDING WARRANTY OF MERCHANTABILITY OR WARRANTY OF FITNESS FOR A 
PARTICULAR PURPOSE.  BUYER MAKES NO RELIANCE ON ANY REPRESENTATION OF DEK CANADA INC 
EXPRESS OR IMPLIED, WITH REGARD TO THE GOODS AND ACCEPTS THEM “AS-IS/WHERE-IS”. DEK 
CANADA INC SELLS THE GOODS TO BUYER ON CONDITION THAT DEK CANADA INC WILL HAVE NO 
LIABILITY OF ANY KIND AS A RESULT OF THE SALE.  BUYER AGREES THAT DEK CANADA INC SHALL HAVE 
NO LIABILITY FOR DAMAGES OF ANY KIND, WHETHER DIRECT, INCIDENTAL OR CONSEQUENTIAL 
DAMAGES, INCLUDING INJURIES TO PERSONS OR PROPERTY, TO BUYER, ITS EMPLOYEES OR AGENTS, AS 
A RESULT OF THE SALE.  BUYER ALSO AGREES TO HOLD DEK CANADA INC HARMLESS FROM ANY CLAIMS 
BUYER, OR ANY THIRD PARTY, MAY HAVE AS A RESULT OF BUYER’S USE OR DISPOSAL OF THE GOODS. 
BUYER HAS READ THIS DISCLAIMER AND AGREES WITH ITS TERMS IN CONSIDERATION OF RECEIVING THE 
GOODS.

NOTICE

Any changes or modifications to DEK Canada Inc. equipment not expressly 

approved by DEK Canada Inc. could void the manufacturer’s warranty and 

could void the user’s authority to operate the equipment.

1908 St-Regis Blvd.

Dorval, Quebec, Canada

H9P 1 H6

www.dekcanada.com

Thank you for choosing a DEK Canada Inc. product.

Please read this manual carefully before using the product.

The DEK Canada Inc. - Firefly™ Transmitter is a very small (1-1/2” x 
2-1/8” x 3/8”) key chain style wireless transmitter operating at 311 MHz. 
The Firefly™ achieves its small size by using state-of-the-art, surface mount 
components. It has been designed for use with dip switch receivers 
operating at 311 frequency.

 

NOTICE

Any changes or modifications to this equipment not expressly approved 
by KEYSTONE HEDDOLF could void the manufacturer’s warranty and could 
void the user’s authority to operate the equipment.

WARRANTY

The warranty period of the Firefly3™ transmitters is twenty-four 
(24) months. This warranty shall begin on the date the transmitter is 
manufactured. During the warranty period, the product will be repaired 
or replaced if the product does not operate correctly due to a defective 
component. This warranty does not extend to (a) the transmitter case, which 
can be damaged by conditions outside the control of KEYSTONE HEDDOLF, 
or (b) battery life of the transmitter. This warranty is further limited by the 
following disclaimer of warranty and liability:

EXCEPT AS SET FORTH ABOVE, KEYSTONE HEDDOLF MAKES NO WARRANTIES REGARDING THE GOODS, 
EXPRESS OR IMPLIED, INCLUDING WARRANTY OF MERCHANTABILITY OR WARRANTY OF FITNESS 
FOR A PARTICULAR PURPOSE. BUYER MAKES NO RELIANCE ON ANY REPRESENTATION OF KEYSTONE 
HEDDOLF EXPRESS OR IMPLIED, WITH REGARD TO THE GOODS AND ACCEPTS THEM “AS-IS/WHERE-
IS”. KEYSTONE HEDDOLF SELLS THE GOODS TO BUYER ON CONDITION THAT KEYSTONE HEDDOLF 
WILL HAVE NO LIABILITY OF ANY KIND AS A RESULT OF THE SALE. BUYER AGREES THAT KEYSTONE 
HEDDOLF SHALL HAVE NO LIABILITY FOR DAMAGES OF ANY KIND, WHETHER DIRECT, INCIDENTAL 
OR CONSEQUENTIAL DAMAGES, INCLUDING INJURIES TO PERSONS OR PROPERTY, TO BUYER, ITS 
EMPLOYEES OR AGENTS, AS A RESULT OF THE SALE. BUYER ALSO AGREES TO HOLD KEYSTONE HEDDOLF 
HARMLESS FROM ANY CLAIMS BUYER, OR ANY THIRD PARTY, MAY HAVE AS A RESULT OF BUYER’S USE 
OR DISPOSAL OF THE GOODS. BUYER HAS READ THIS DISCLAIMER AND AGREES WITH ITS TERMS IN 
CONSIDERATION OF RECEIVING THE GOODS.

1A - General information

The KEYSTONE HEDDOLF - Firefly™ Transmitter is a very small 

(1-1/2” x 2-1/8” x 3/8”) key chain style wireless transmitter 

operating at 311 MHz.The Firefly™ achieves its small size by using 

state-of-the-art, surface mount components. It has been designed 

for use with dip switch receivers operating at 311 frequency.

For more information, 

please visit www.devancocanada.com

KEYSTONE HEDDOLF T-931-MH

TYPE: FIR311DEK31K • FCC ID: SU7311DEK31K

 

This device complies with Part 15 of the FCC Rules.

 

Operation is subject to the following two conditions:

 

(1) This device may not cause harmful interference, and

 

(2) this device must accept interference received, including

 

interference that may cause undesired operation.

Please read these programming instructions carefully 

before using the product.

  

Made in Taiwan.

1 - TRANSMITTER OVERVIEW

 

1A - General information

 

2A - Technical specifications

 

1C - Main components

3 - PROGRAMMING
4 - OPERATION
5 - BATTERY ACCESS
6 - TROUBLESHOOTING

KEYSTONE HEDDOLF 

T-931-MH

TRANSMITTER

CONTENTS

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