Smart Volume Control - 144 WATTS - Pairs with Amazon Dot - Wireless Operation NOW SHIPPING NEW BT2 version: Create a Bluetooth wireless zone for inwall, in-ceiling or bookshelf speakers without complicated wiring. Powerful and efficient built-in CLASS D amplifier. 30 Watts per channel nominal. 144 Watts Instantaneous Peak. Uses 24 volts for more stable audio and higher power output. (NOT INCLUDED) Can replace existing passive volume controls to create separate zone control of remote room. Pairs easily with Amazon Dot. Use smart phones, MP3 players and portable devices with minimum Bluetooth 3.0 (up to 4.1) connectivity