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【Wireless Visual Intercom Doorbell】: Our 4.3-inch screen 2.4 wireless visual intercom doorbell provides a clr and wide view, allowing you to see who\u0027s at the door without opening it. It\u0027s a smart doorbell that offers high-definition video monito for your home. 【 Battery Life】: Equipped with an 800mAh battery, the doorbell can last up to 2 months with 10 daily presses after a full . Plse note that the further the distance, the more power it consumes. 【Night \u0026 Wide Viewing Angle】: With 4 advanced 850nm infrared night lights, the doorbell NaIntelligently optimizes night mode, allowing you to see clrly even in pitch darkness. It offers a viewing angle of 70 degrees, providing a comprehensive view of your doorstep. Power Supply: 4 * battery (not included in this product) Static Current:Working Current:Maximum Working Current:Card Type: IC/M1, mobile NFC Card Storage Quantity: 18 Working Temperature10 ~60 Working Humidity: 30 ~85 Storage Humidity:Lock Body Size: 7.6 * 7.6 * 3cm/2.9 * 2.9 * 1.2inch Lock Body Weight: 109g/3.8oz Lock Buckle Size: 7 * 2.5 * 3.7cm/2.8 * 1 * 1.4inch Lock Buckle Weight: 38g/1.3oz