TINOR Wireless Doorbell, No Battery Required Wireless Door Chime with 2 Receivers, 150m Range Waterproof Push Button with 38 Chimes, 4 Level Volume and led

General description This wireless doorbell features the latest RF push technology, requiring no batteries or cables, making it an environmentally friendly and cost-effective solution. When the transmitter is pressed, it generates its own electric current and sends a stable signal to the receiver, eliminating the hassle of changing batteries. With 38 ringtones and 4 volume levels, including mute, this doorbell allows you to customize your experience. It also has a memory function that retains your last settings after a power outage. Technical specifications Transmission Power: Self-Powered Receiver Power Supply: AC 110-240 (V), 50/60Hz Receiver Power Consumption: 0.25W Ring Tones: 38 Melodies Volume Levels: 4 Levels Transmission Range: Up to 152m (in open area) Operating Frequency: 433MHz Operating Temperature: -4°C to 140°C Installation Installation is straightforward: simply connect the mini receiver to an outlet and attach the transmitter to a wall. This doorbell is suitable for