Check the listing for details. ECCO 102 dB 12-24 V Dual-Function Warning Alarms. Condition: New. Listed at 85.20 USD. Universal 102 dB 12-24 V Dual-Function Warning Alarms by ECCO®. Dual function alarm provides back-up alarm and dual tone features in a compact housing. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great quality at an affordable cost.