This BB11 extension tube is suitable for F11R flashlight. After installing this BB11, F11R can use 2 21700 batteries (INR21-60) to increase the battery life
This link is just an extension tube

.buy-record img{margin:0px !important;}
- 
				User name 
 Member Level
 Quantity
 Specification
 Purchase Date
.buy-record img{margin:0px !important;}
 Satisfaction :
- 
				     
.popups{ position:fixed; background:rgba(0,0,0,0.4); bottom:0; top:0;left:0;right:0; display:none;}
.shows{position: absolute;display: none}
.bigs{ width:300px; }
.lefts{ position:absolute; top:125px; left:-50px; cursor:pointer;}
.contecenter{width: 100%;height: 100%;position: relative;display: flex;justify-content: center;align-items: center;top:0;}
.rights{ position:absolute; top:125px; right:-50px; cursor:pointer;}


$(function(){
    $(“.popups”).click(function(){
		$(“.shows”).hide();
		$(this).hide();
	});
    function changeTop(){
        var bigs = $(“.bigs”).height();
        var tops = (bigs – 57)/2;
        $(“.lefts,.rights”).css(“top”,tops+’px’);
    }
    $(“.show_pic_div img”).click(function(){
		$(“.popups”).show();
		$(“.shows”).show();
		bigImg=$(this).attr(“src”);//获取点击图片的地址
		$(“.shows img.bigs”).attr(“src”,bigImg); //更换大图的图片地址
		_index=$(this).index();//保存图片的序列号
         changeTop()
 	}); 
    $(“.shows .rights”).click(function(){
        event.stopPropagation();
        var maxlen = $(“.show_pic_div img”).length;
		_index++;
		if(_index>maxlen-1){_index=0};
		bigImg=$(“.show_pic_div img”).eq(_index).attr(“src”);
		$(“.shows img.bigs”).attr(“src”,bigImg);
        changeTop()
	});
	$(“.shows .lefts”).click(function(){
        event.stopPropagation();
		_index–; //序列号加1 _index+1
        var maxlen = $(“.show_pic_div img”).length;
		if(_index<0){_index=maxlen-1};
		bigImg=$(".show_pic_div img").eq(_index).attr("src");
		$(".shows img.bigs").attr("src",bigImg);
        changeTop()
	});
});
 
				 
				
 
				 
				 
						 
						 
					





 
		 
		 
		 
		 
		 
		