General description The Wireless Doorbell features a waterproof design and operates effectively within a range of 1000 meters. It includes two indoor receivers and is powered by rechargeable batteries, making it a practical choice for various settings such as homes, hotels, and hospitals. Technical specifications Outdoor Doorbell: Battery type: 3 x 1800mAh rechargeable lithium battery (built-in) Working temperature: -20℃ to 50℃ Wireless distance: 1000m (without barrier), 20-50m (with barrier) Wireless frequency: 410-490MHz Working hours: more than 8 months Waterproof Grade: IP54 Product Size: Approx. 121.5 x 61.5 x 313 mm / 4.8 x 2.4 x 1.2 inches Indoor Doorbell: Working hours: Approx. 3-5 days Size: Approx. 125 x 70 x 56 mm / 4.9 x 2.8 x 2.2 inches Compatibility and accessories Includes: 1 x Outdoor Machine 2 x Indoor Machines 2 x Charging Bases 3 x USB Cables 1 x Screwdriver 1 x User Manual Installation Easy to install with included mounting hardware and user manual. Usage Press the