Home - Intruder - Internal Sounders & Speakers - External Sounders External Sounders Browse Products An effective visual and audible deterrent against intruders. Browse Products Essential Components, Reliable Performance External Sounders are an effective visual and audible deterrent against intruders. CQR offer a range of innovative and fully approved solutions for commercial and domestic property. VIEW OUR PRODUCTS View our wide range of external sounders here. BROWSE