General description The Wireless Intercom Doorbells provide a reliable communication solution for homes, hotels, offices, and factories. With a long-distance signal transmission range of up to 1000 meters in open space and 20-50 meters with obstacles, these doorbells ensure strong penetration without interference to other devices. The system includes an intercom light for easy visibility, making it user-friendly for all ages. Technical specifications Power supply mode: Rechargeable lithium batteries (2000mAh) for both outdoor and indoor units Operating temperature: -20°C to 55°C Transmission distance: 1000 meters (open space) Operating frequency: A frequency 434 MHz, B frequency 462 MHz Charging time: Approximately 5 hours Dimensions: Outdoor and indoor unit - 116 x 56 x 18 mm; Waterproof cover - 121.5 x 61.5 x 31.3 mm; Charging base - 70 x 56 x 29 mm Packaging size: 14 cm x 9 cm x 6.8 cm; Gross weight: 310 g Ring volume: 3 levels of adjustment Call sound: 3 levels of adjustment