{"version":"1.0","provider_name":"BOCK Kranj","provider_url":"https:\/\/bock.si\/en\/","author_name":"sebastjans","author_url":"https:\/\/bock.si\/en\/author\/sebastjans\/","title":"Whistle without sound with adjustable frequency - BOCK Kranj","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"RcrDbLJAu9\"><a href=\"https:\/\/bock.si\/en\/shop\/whistle-without-sound-with-adjustable-frequency\/\">Whistle without sound with adjustable frequency<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/bock.si\/en\/shop\/whistle-without-sound-with-adjustable-frequency\/embed\/#?secret=RcrDbLJAu9\" width=\"600\" height=\"338\" title=\"&#8220;Whistle without sound with adjustable frequency&#8221; &#8212; BOCK Kranj\" data-secret=\"RcrDbLJAu9\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/bock.si\/wp-includes\/js\/wp-embed.min.js\n<\/script>\n","description":"&nbsp; Sprenger dog training whistle. Set the frequency by first unscrewing the safety &#8220;nut&#8221; and then adjusting the frequency as desired by tightening or loosening the stem. Tighten the safety nut backwards to prevent the stem from moving. When the whistle is blown, the human ear only detects the high-pitched tone, but the dog will&hellip;","thumbnail_url":"https:\/\/bock.si\/wp-content\/uploads\/2025\/09\/bock-kranj-feat.jpg","thumbnail_width":1429,"thumbnail_height":804}