Digital doorbell - Saicoo Wireless digital doorbell: Reaches 1000 feet working distance. Timeless and classic design - 52 classical door chimes. Transmitter battery included. Radio distance reaches 1000 feet. Use latest unique technology, the wireless distance can reach 300meter. Adopt most stable music chip, preload 52 door chimes. Four levels of adjustable volume, meet the needs of different environment Intelligent digital remote control doorbell, ideal for homes, offices, guest rooms, hotels, hospitals etc Easy installation, plug and play. Easily plug into an electrical outlet (no batteries required for main receiver). CUSTOMER SATISFACTION GUARANTEE 100% - if you are not completely satisfied for whatever reason, simply contact us to request a full refund, or replacement! 1 year warranty!