・【Smart Visual Doorbell】 U9 smart visual doorbell with ERP mobile detection and snapshot functionality,requiring a WiFi connection for operation ・【Long Battery Life】 Features a 3600mAh polymer battery,providing over 6 months of normal use and up to 1 year of standby time ・【Quick Charging】 Fully charges in just 1.5 hours,ensuring minimal downtime ・【Cloud Storage】 Includes 3 days of free permanent rolling storage with unlimited interactions ・【High-Quality Video】 Equipped with a 640*480 resolution camera for clear visual communication Specifications: ・Material: ABS plastic ・Battery: 3600mAh polymer ・Power Input: 5V⎓1A ・Camera Resolution: 640*480 (300,000 pixels) ・Doorbell Dimensions: 136*72*35mm (L*W*H) ・Indoor Unit Dimensions: 55*42*25mm (L*W*H),37mm height including USB ・Weight: Doorbell-201g,Indoor Unit-23.3g,Total-224.3g ・Communication Type: Color visual smart intercom ・Storage: 3 days of rolling cloud storage ・Charging Time: 1.5 hours ・Standby Time: 1 year Package included: ・1 x Smart Doorbell ・1 x Indoor Chime ・1 x Charging Cable ・1 x Screwdriver ・1 x English and Chinese User Manual