AuYou Wireless Doorbell Portable Door Chimes with 1 Remote Button Transmitter and 2 Receivers Operating at over 300-feet Range with 36 Chimes 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 remote button over 300 FT operating range in open area; Wireless range depends on construction and materials. 36 Polyphonic melodies for you to choose for the specific receiver chime,with 3 levels (low, medium, high)volume adjustable (85db) for the wireless doorbell kit. Led flashes on transmitter and receiver for indication purpose; The doorbell receiver not include battery but mounted very easy; CEFCCROHS certified. Package contents: Portable AuYou Doorbell Chime x 2; Button x 1; DC3V CR2032 x 1; Screws x 4; Anchors x 4; Double-side sticker x 1; User Manual x 1.