•Temperature display: Automatically detect the ambient temperature and display the real-time temperature •150m range: It will not interfere with other electrical appliances, ensuring that even if you are a few rooms away, you will not miss visitors •38 ringtones: clear sound, 4 levels of volume. Easily choose from 38 ringtones •High-performance transmitter: ultra-low power consumption, dustproof and waterproof •Simple setup and use: Just plug the receiver into a power outlet, and then fix the transmitter on the wall •Multi-purpose: suitable for families, apartments, classrooms, offices, villas, etc. It is a pager for the elderly, able to send out signals when they need it most •No battery required: Press the external bell button to convert mechanical energy into electrical energy Specification: •Project Type: Wireless Doorbell •Plug: EU plug •Receiver: •Size: about 78x72x20mm •Function: temperature display •Voltage: 80-260V work •Frequency: 433MHz •Optional ringtones: 38 melodies •Volume: Level 4, mute •Receiving range: 150m •Transmitter: •Waterproof: IP44 •Working voltage: DC 12V / 23A •Working current: