EasyAcc Wireless Doorbell Portable Wireless Door Bell Kit 52 Melodies Over 650 ft Operating Range (1 Remote Button & 2 Plug-In Doorbell Chime ) White Wireless range up to 650ft (200m) on open air that you will not miss any visitors, no matter where you are in door; IP44 Water-Resistant ,:Lightweight, Dustproof design, comprehensive protection; Widely Application : compatible with home furnishing, office buildings, hotels, factories; Easy to Use: Simply plug receiver into the outlet, battery for push button is included; Over 50 dulcet polyphonic melodies and 4 grades volume regulation ; Built-in speakers make the sound crisper and sweeter;