SadoTech Model CXR Wireless Doorbell with 1 Remote Button and 2 Plugin Receivers Operating at over 500-feet Range with Over 50 Chimes, No Batteries Required for Receivers, (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. 1 transmitter button triggers (rings) 2 chime units. (Note: The 2 chime units can each be configured to ring with different melodies/ringtones.) A perfect use case scenario for this product would be if you have a first floor and basement, garage, or second floor and you want both areas to ring from someone pressing a single transmitter button. Over 50+ different ring tones. Operating range of over 500 feet (1000 feet in open area). Four levels of adjustable volume from 25db to 110db. 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.