White plastic doorbell wireless installation design, reducing the trouble and expense of installation and accurate "RF ISO code" technology from interfering with each other, for homes, restaurants, factories, and other places of use. White plastic door is constructed using high quality industrial plastics into, packed in blister card, equipped with Bell and batteries, using battery power, reference wholesale price negotiable, Qty 60 kcal/pieces. White plastic door material is not aging, fading and corrosion characteristics of sound-built-in dual stereo speakers, sound crisp, minimum order quantity is 1 or more.