More space， more music， more special passion......36 different melodies for selection， you can select you favorite LED indicator flashes when bell ringsNever miss a visitor or delivery againNo wiring or drilling， wireless transmission to master the itemSimple vivid installation design， save money when installation and don't effect the decorate environment Excellent function， easy usage， energy saving， and high sensitivity make it meet the need of market and consumers liveThe ultra-long distance can reach 150 meters away. It can overcome any obstacles during the course of transmission and receiving， so it is suitable for: dwelling house， tier building， multiple apartments， hotel， factory， hospital or any other places.It not only brings you convenience， but also give you the unexpected happiness and freedom.Package includes:2 X Wireless Doorbell Receiver1 X Wireless Remote Button1 X 23A 12V Battery