MEKO Wireless Doorbell, Long Range Portable Plug-in Door Chime [No Batteries Required for Receiver],Waterproof Push Button with LED Indicator for Indoor /Outdoor Use -(White) WIRELESS RANGE- Operating range of over 500 feet. (1000 feet in open area). Built in anti-interference design; Flame retardant; ABS material; THE RECEIVER - No batteries required for the receiver. Simply plug it into an electrical outlet. 52 different Stereophonic ring tones. Super easy to adjust with 4 levels of volume (from 25db to 110db.) FCC, CE, ROHS approved; THE PUSH BUTTON/TRANSMITTER - 1 pcs 12V 23A alkaline battery Needed (included),Super power-saving mode; IP55 waterproof and acceptable for outdoor use. It can be mounted with supplied double-sided adhesive tapes or fixed to the doorframe with screws DOORBELL KIT: 1 push button (transmitter) ; 1 AC door chimes (receivers) ; 2 x 12V 23A alkaline batteries ; 2 x Screws; 2 x Double-Sided Adhesive Tape;1 x User Manual WARRANTY TERM: One year Manufacturer Warranty, Free life-time Tech-Support