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Square Shape Mechanical Dongdong Doorbell. OEM Design and Voice: Customizable design and voice options available for OEM orders. High Durability: Reliable mechanism designed for more than 5 years of use. Wide Voltage Support: Operates on AC 110V-240V, suitable for global markets. Premium Sound Quality: Produces a clear Ding Dong sound at 85dB. Robust Material Build: Constructed with PC/ABS, Nylon, Steel, and Copper. Global Export Experience: Exported to more than 20 countries worldwide.