ANENG Wireless Plug in Doorbell Chime 4 Mode Volume With 32 Melodies volume and 32 chimes36 Polyphonic melodies adjustableand anti interference avoide string of ring. Plug-in, wireless installation, convenient and quick. Energy saving,waterproof and long time use Receiver Size75x80mm Launcher Size:50x80mm Package Size:120*70*160mmmm