AuYou Door Bell Kits Wireless Doorbells, Doorbell Chimes with 500 ft. Range, 1 Transmitter and 2 Receivers with 52 Melodies 2016 Fashion, elegant and stylish design doorbell push buttons fit into any home and office; ABS material attributes of high rigidity which is also anti-burn and impact resistance. IP44 Waterproof / Dustproof touching touch button over 500 FT operating range (1000 FT open area); Wireless range depends on construction and materials. 52 Various melodies for you to choose for the specific receiver chime,with 4 levels volume adjustable (from 25db to 110db) for the wireless doorbell kit. The doorbell chime plugin receiver no need battery and mounted very easy; Plug the reseiver into a standard plug socket, then it works; CEFCCROHS certified. Package contents: AuYou Doorbell Chime x 2; Button x 1; Battery 12V 23A x 1; Screws x 2; Anchors x 2; Double-side sticker x 1; User Manual x 1.