General description The Discipline Wireless Doorbell Calling Device is a smart doorbell designed for home reminders and two-way calls. Its slim profile, measuring only 18mm in thickness, sets it apart from thicker alternatives on the market. The device features a user-friendly design with high-quality materials for a comfortable feel. Technical specifications Power supply mode: Rechargeable lithium batteries for both outdoor and indoor units Battery capacity: 2000mAh for both outdoor and indoor units Working temperature: -20°C to 55°C Transmission distance: Approximately 1000 meters in open space Working frequency: B frequency 462 MHz, A frequency 434 MHz Charging time: About 5 hours Host size: Outdoor and indoor unit dimensions: 116mm x 56mm x 18mm Waterproof cover size: 121.5mm x 61.5mm x 31.3mm Charging base size: 70mm x 56mm x 29mm Ring volume: 3 levels of adjustment Call sound: 3 levels to adjust the call size Installation The charging stand of the outdoor unit must be removed