Meets ABYC a-23 for boats up to 12 meters. Size: 3''lx3-1/4''wx1-3/4''h. Max amp draw: 3 Amps. Grill dimensions: 4-7/8''x2-3/8'' with four hole centers. Rating: 105 db at 1 meter. Fundamental frequency: 410 Hz+/-20. Stainless Steel Horns: All Stainless Steel Inside & Out. 304 Stainless Steel inside & out including sealed sound unit. No rust. Guaranteed for 5 years. All meet ABYC A-23 for boats up to 12 meters. Pre-wired, Fits existing hole patterns. SCHMITT & ONGARO 10050 Ongaro Mini Single Drop-In Horn with SS Grill - 12V Low Pitch Schmitt & Ongaro 10050 Ongaro Mini Single Drop-in Horn With Ss Grill - 12v Low Pitch.