General description This YMYNY Automatic Battery-Free Waterproof Wireless Outdoor Doorbell combines functionality and style, featuring a temperature, humidity, and time display. It is designed for easy installation and use, making it an ideal choice for any home. Technical specifications Plug-in receiver voltage: AC85-260V (EU) Power consumption: Transmitter: 20 mA, Receiver: 140 mA Waterproof rating: IP44 (Type P, N, T) Operating frequency: 433.92 MHz Operating temperature: -20°C to 65°C Detection range: Up to 180 meters outdoors Transmitter lifetime: 200,000 activations Pressure required for transmitter activation: 3-4N Volume range: 0-100 dB, with 4 adjustable levels Optional ringtones: 38 melodies Installation No wiring or electrical installation required Installation can be completed in 1 minute by plugging the receiver into a power outlet Place the button in the desired location Usage Provides timely reminders to ensure you won't miss important moments Detects indoor temperature