德国采购需求：蜂鸣器扬声器、12V蜂鸣器报警器、蜂鸣器报警器、压电蜂鸣器、电子蜂鸣器、无线蜂鸣器

We're on the lookout for a speaker that meets specific requirements for an upcoming project. The ideal speaker should deliver a minimum sound pressure level of 90 dB at a distance of 1 meter, have a power rating of up to 5 W, and an impedance of either 4 or 8 Ω. We're also aiming to keep the cost under $0.60 and the size constraints are quite tight—maximum diameter of 56 mm and a depth of no more than 18 mm. Additionally, it's crucial that the speaker comes with a UL Certificate for safety compliance. If you have options that match these criteria, please share the details and any relevant specifications. Looking forward to your prompt response!