Wireless Doorbell, Aogek 52 Melodies and 300M/1000Feet Operating Range (1 Doorbell Chime and 1 Button), Musical 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