CROSSPOINT Expandable Wireless Doorbell Alert System, Multi-Unit Base Starter Kit includes 2 x Long Range Plug in Receivers and 2 x 100% Waterproof Transmitter Buttons, Model ECBase, 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. NOW WITH NEW & IMPROVED CHIMES/RINGTONES. CROSSPOINT EXPANDABLE DOORBELL System in Classic White or Black. Choose from 4 different base kits and WATERPROOF buttons to suit your needs. EXPANDABLE DOORBELL SYSTEM LETS YOU DESIGN YOUR HOME-ALERT NETWORK with 20+ additional receivers, transmitters, and motion or door sensors. Custom build your own system that fits for your needs. Easy to use pair-able code technology allows you to mix and match Crosspoint components easily with one or multiple receivers. ASSIGN UNIQUE RINGTONES to each transmitter to instantly know which one was triggered. Over 50 different melodies and ringtones make this the ideal wireless doorbell system for multi-entry structures. Four levels of adjustable volume from 25db to 110db. OVER 500-FOOT LONG-RANGE OPERATION penetrates steel doors, exterior walls and interior walls. No new wiring required for implementation. SIMPLY PLUG RECEIVER INTO ELECTRICAL OUTLET (no batteries required for main receiver). Easy to install with included mounting hardware and basic tools 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. We are proud to announce we have 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.