Bestrix Smart Wireless Doorbell with Receiver Operating at over 1,000-feet Range with 36 Chimes, Battery Included OPERATING RANGE OF OVER 600 FEET. (1000 feet in open area). Remote transmitter button is specially designed with quality materials for outdoor use BEAUTIFUL TUNES & SOUND - Select from 36 tones, with 4 adjustable volume settings. AMAZING DECOR FOR HOUSE Unique stylish, elegant and modern design. With beautiful Led indicator on the receiver & transmitter of the door bell, JUST PLUG RECEIVER INTO AN ELECTRICAL OUTLET (no batteries required for main receiver). A Self-learning code system automatically adjusts to eliminate interference Includes 1 plugin receiver unit and 1 remote transmitter button, double sided sticker, LR 23A (12V) alkaline battery for remote transmitter & product manual