SadoTech Wireless PIR Motion Sensor Doorbell Operating at over 500-feet Range with Over 50 Chimes, No Batteries Required for Receiver, (White) AS SEEN ON BUSINESS INSIDER, FOX, ABC, NBC & CBS News - "It's built well, and it has a nice minimalist style" - Business Insider, 08/21/15. Our doorbells are great looking, loud, and reliable. Unique doorbell with motion sensor detector that triggers the doorbell main unit. Creative uses such as alerting when someone approaches the door or driveway, when your mailbox is opened, alerts when a window or door is opened, alerts when a perimeter is breached. Can be used as a simple alert unit instead of investing in costly security systems. Detection time delay in between motion sensor alerts is configurable from 15 seconds to 30 seconds. Operating range of over 500 feet (between sensor and main chime unit). Receiver easily plugs into an electrical outlet (no batteries required) Note: Manual is attached above the Product Description for SetUp and Trouble Shooting Tips. Motion sensor range area is about 12meters (40 feet) area at an angle of 110 degrees. Operating range of over 500 feet (between sensor and main chime unit). Receiver easily plugs into an electrical outlet (no batteries required). Includes 1 plugin receiver unit and 1 motion sensor, anchors, screws, and battery for motion sensor. (This unit is NOT compatible with Starpoint L Series) DOWNLOAD OUR "10 MORE WAYS TO USE SADOTECH DOORBELLS GUIDE - Did you know that our customers use SadoTech doorbells to train dogs, teachers love using it to quiet down classrooms, seniors and disabled use SadoTech doorbells as assisted living call pagers, and more! SCROLL DOWN on this page to the Technical Specs section below and click the Application Guide link to DOWNLOAD the PDF file. Open it with Adobe Acrobat Reader. WANT TO LISTEN TO OUR CHIMES/RINGTONES BEFORE YOU BUY? GO AHEAD - Just SCROLL DOWN to the Technical Specs section below and click on the Specification Guide link to DOWNLOAD the PDF file. Open it with Adobe Acrobat Reader to play all 52 ringtones. Were proud to announce weve developed a custom music chip in our doorbells that includes carefully selected. Over 50+ different ringtones. Operating range of over 500 ft (1000 ft in open area). 4 levels of adjustable volume from 25db - 110db.