Wireless Doorbell, Waterproof Door Bell, Wall Plug-in Cordless Chime, 300m/1000ft Range, 36 Melodies to Choose, 4 Level Volume, White

Came nicely boxed with tools and easy to understand manual, this was so easy to put together only took a few minutes, I live in a rented bungalow so I can not drill so I used the double sided tape that came with this and put it on my pvc door that blends in well. The plug in sound transmitter has arrange of melodies or just a normal door bell chime to choose from and can also adjust the loudness or turn off the sound altogether. Love how this is wireless and not having to pair them up etc.. it's ready to go as soon as you put the battery in. 

Overall would highly recommend this door bell to anyone, no drilling if you do not want to but do come with screws. 

This plugs in to any standard wall outlet and easy to operate. This will work with a range upto 1000ft with 4 volume levels so you wont miss anything. Also you have a choice of chimes there are 36 different chimes to choose from that best suit. But if you have hard of hearing this will give off a flashing light. 
Each door bell set has it's own nique codes to prevent interference from other users.