Wireless Doorbell, Aogek Waterproof Button 52 Melodies and 300 M Operating Range (A Doorbell Chime and a Button), Scrub Style 52 seletable ringtones, 4-Level Adjustable Volume from 0-85 db, Operating at over 1000-feet Range, IP44 Waterproof, Easy installation, 100% customer service 52 chime tones and 4 levers of volume(from 0 ~85dB ) for your choice No wiring required,neither inference to or from nearby wireless products Ease to use Supports working range up to 1000ft/300m in open area 5.plugin receiver for you to take it to basement,garage or second floor