Self-Power Wireless Doorbell with 38 Chimes, 150M Long Wireless Range, Waterproof Design, Adjustable Volume Levels, No Battery Required Strong signal performance penetrates 3-4 walls with a wireless range of up to 150 meters in open areas, suitable for large homes, apartments, offices, shops, and warehouses. IP68 rated waterproof protection ensures reliable operation in rainy conditions, providing durability and long-term use. Offers 38 selectable chimes for home or office use. The doorbell includes a mute function for quiet hours or nighttime use. Functions as both a doorbell and a signaling device. Ideal for monitoring elderly family members, babies, or individuals needing assistance. Press the transmitter to activate the receiver chime. Equipped with smart learning mode for easy setup. Compatible with multiple plug types including EU, UK, and US standards, ensuring compatibility with various power 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 1 meter - Transmitter: Battery-free design - Receiver dimensions: 95 x 54 x 68 mm - Transmitter dimensions: 80 x 50 x 28 mm - Wireless range: 150 meters (open space)