2PCS Wireless Self-Powered Plastic Doorbell

2PCS wireless self-powered plastic doorbell, integration of humidity, temperature and time, real-time monitoring of environmental changes Self-powered doorbell, wireless doorbell, integrated temperature and humidity doorbell Product name: Wireless self-powered doorbell Colour: Black material: plastic Weight: 0.486kg Working temperature: -50C~99C Working humidity: 0%-99% Receiving voltage: 100-260V Volume: 0-100 decibels Receiving distance: 150M If waterproof: Yes, the button waterproof grade is IP44 Doorbell size: 68*100*22MM Button: 77*44*19MM Features: Can view working temperature and working humidity, real-time monitoring of environmental changes (Fahrenheit and Celsius can be converted)