Self-Power Wireless Doorbell 1. 32 Songs Home Welcome Door Chimes 2. 150M Long Wireless Control Distance 3. Waterproof Door Bell 4. Four Levels of Volume 5. Self-Power, No Battery Required Feature 1: Strong Signal It can penetrate 3-4 walls and has a wireless range up to 150 meters in open areas, suitable for large houses, apartments, offices, shops, and warehouses. Feature 2: IP68 Waterproof Rating Can be used in rainy conditions, durable and reliable. Feature 3: 38 Songs Home Welcome Door Chimes Doorbell can be muted during sleep hours. Feature 4: Dual Function – Doorbell and Call Button Ideal for use as a call system for elderly individuals, babies, or pregnant women when they need assistance. Feature 5: Smart Learning Mode with User-Friendly Design Includes multiple plug types: EU, UK, and US, ensuring compatibility with various outlets. Specifications: - Operating Voltage: AC 100–230V - Power Consumption: 0.25W - Wireless Frequency: 433 MHz - Operating Temperature: -10°C to +45°C - Ringtone Volume: >50dB at 1m - Transmitter: No battery required - Receiver Size: L95 x W54 x H68mm - Transmitter Size: L80 x W50 x H28mm - Wireless Range: 150 meters (open space)