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Our wireless & digital doorbell is featured in disturbance-resistant design, 1/100, 000 digital cryptographic coding, 150-meter remote control, and environmental disturbance resistant. The controller is attached with a 9v battery with 1-year service time. The doorbell is configured with 3 1.5v batteries. For more information about us and our products, please visit our websit.Trademark: Allight Model: E-308DCA
