    <SEC-DOCUMENT>0001387131-21-007419-index.html : 20210719
    <SEC-HEADER>0001387131-21-007419.hdr.sgml : 20210719
    <ACCEPTANCE-DATETIME>20210716213753
    ACCESSION NUMBER:		0001387131-21-007419
    CONFORMED SUBMISSION TYPE:	424B4
    PUBLIC DOCUMENT COUNT:		8
    FILED AS OF DATE:		20210719
    DATE AS OF CHANGE:		20210716

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Byrna Technologies Inc.
    		CENTRAL INDEX KEY:			0001354866
    		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES [3690]
    		IRS NUMBER:				711050654
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1130

    	FILING VALUES:
    		FORM TYPE:		424B4
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-256684
    		FILM NUMBER:		211096689

    	BUSINESS ADDRESS:
    		STREET 1:		100 BURTT ROAD
    		STREET 2:		SUITE 115
    		CITY:			ANDOVER
    		STATE:			MA
    		ZIP:			01810
    		BUSINESS PHONE:		978-868-5011

    	MAIL ADDRESS:
    		STREET 1:		100 BURTT ROAD
    		STREET 2:		SUITE 115
    		CITY:			ANDOVER
    		STATE:			MA
    		ZIP:			01810

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	Security Devices International Inc.
    		DATE OF NAME CHANGE:	20060301
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>424B4
    <SEQUENCE>1
    <FILENAME>byrna-424b4_071621.htm
    <DESCRIPTION>AMENDMENT TO FORM S-1
    <TEXT>
    Document 1 - file: byrna-424b4_071621.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>byrna-01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: byrna-01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>byrna-02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: byrna-02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>byrna-03.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: byrna-03.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>byrna-s1a_071221img001.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: byrna-s1a_071221img001.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>byrna-s1a_071221img003.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: byrna-s1a_071221img003.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>byrna-s1a_071221img004.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: byrna-s1a_071221img004.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>byrna-s1a_071221img005.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: byrna-s1a_071221img005.gif

    </DOCUMENT>
    </SEC-DOCUMENT>