AITENG V018J Wireless Batteryless WIFI Doorbell, EU Plug 1. Working mode: self-powered doorbell 2. Receiver working voltage: 110V-240V 3. Power: less than 2W 4. Working frequency: 433.92MHZ 5. Remote control receiving distance: more than 150m (open area) 6. AC terminal (pin): US plug, EU plug, UK plug 7. Transmitter operating frequency: 433.92MHZ 8. Transmitter operating current: less than 15mA 9. LED indicator: press the launch button, the LED of the transmitter is on, the transmitter works, and the receiver receives the command, also sends listening to music, reminding you that VIPs are visiting, and the "green light" LED on the receiver is also accompanied by regular music flickering. 10. Audio source: 38 sound sources are available for selection, and the external touch button "UpDown" is completed. Sources include: European, American, Asian and other world famous songs, as well as 10 Arabic songs that Middle Eastern customers like) 11. Volume adjustment function: Hi (high), Med (medium), Lo (low) three kinds of volume can be selected, through the external switch (or button) operation is completed