AuYou Waterproof Wireless Touch Doorbell Chimes with 2 Receivers and 1 Transmitter Operating at over 500-feet Range with Over 52 Melodies Chimes White 2016 Fashion and elegant design doorbell push buttons. ABS material attributes of high rigidity which is also anti-burn and impact resistance. IP44 Waterproof / Dustproof 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 Chimes 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.