CACAZI A10 A10 Wireless Doorbell Waterproof 100-240V 300M Range Music Door Bell Home 60 Chimes Door Ring 2 Receiver 1 Transmitter

The doorbell can use in office, home, hospital, factory,restaurant or any where you need it.
300 meter receiving distance (In the open area),Stable quality is ideal for villas, hotels, schools and other areas.
The button cannot be placed on an iron door because it will interfere with the signal.
Just plug the receiver into an electrical outlet,the push button transmitter can be stick it to the door with provided adhesive tapes.