Factory OEM Wireless Two to Three Doorbell Music / Ding dong Non-visual doorbell

Receiving Frequency:433; What's in the box:3Indoor Unit,2Outdoor Unit; Connection:Wireless; Kit Configuration:Two to Three Doorbell; Additional features:Non-visual doorbell; Answering mode:Ding dong,Music; Material:ABSPC; Brand:Factory OEM; Listing Date:01/24/2019; Production mode:External procurement; Special selected products:COD