E-Series Add-On devices are used to expand an existing E-Series System. They do not have a built-in timer or a power supply cord so they cannot be operated by themselves – a Master device is always needed first. An E-Series Add-On device is supplied with hardware to connect the hinges, and a set of thin “Gap Seals” that can be used if necessary to cover the gap between adjacent devices.
Add-On devices include a 4-year product warranty, a 1-year bulb warranty, an arrival guarantee, and free shipping to most locations in Canada and the USA; all included in the price.
There is nothing else you need to purchase to expand your existing E-Series System and reduce your treatment times.