Topvico 1/2/3/5pcs 433mhz Wirele Doorbell for Home Outdoor Waterproof Transmitter Button Hub Receiver Required Hub Needed (Hub not included) Note: This device needs to be connected to a hub that supports 433mhz acceories (compatible with our WiFi hub and 433mhz hub. Don't forget to check it out in our store!) Waterproof & Wirele Doorbell Easy install with included double-sided tape. How to Work With Hub (receiver)? Please note, the Topvico hub is only there for illustration purposes and is not included. Ultra Long Operating Range 80 meters (open area), 15 to 30 meters indoor, if the detect area is big, suggest order for more hub Power Supply 1 unit CR2032 battery (included) Detail Specification Topvico 1/2/3/5pcs 433mhz Wirele Doorbell for Home Outdoor Waterproof Transmitter Button Hub Receiver RequiredSpecifications:- Technical Parameters: doorbell / transmitter (433Mhz, EV1527)- Operating Range: 80 meters (open area), 15 to 30 meters indoor (according the environments)- Work Mode: doorbell button send signal to hub / receiver, hub / receiver send notification for the visitor is ringing the doorbell- Doorbell button power supply: 1 unit CR2032 battery (included), battery can work more than 12 months.- Install: easy install with included double-sided tape.- Work temperature: about -10 to 50 celsius degreesNote: This device needs to be connected to a hub that supports 433mhz acceories (compatible with our WiFi hub and 433mhz hub. Don't forget to check it out in our store!) After Sale Service