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Wired Door Chime Dingdong Mechanical Doorbell. Durable Material Construction: Made of PC/ABS, Nylon, Steel, and Copper for long-lasting performance. Reliable Sound Quality: Produces a clear 85dB Ding Dong sound with a lifespan exceeding 5 years. Wide Voltage Compatibility: Operates on 110-240V AC, suitable for global electrical standards. Customizable Design and Voice: Offers OEM services for both design and sound customization. Global Export Experience: Exported to over 20 countries since 2005 with proven reliability. Secure Packaging: Each unit is packaged in a protective color paper box.