Dayton Audio Class T Digital Amp/Receiver 15 WPC Overview The DTA-1AR amplifier, part of the DTA-1W wireless mini amplifier system, is also a stand-alone amp. The DTA-1AR features an amplifier efficiency of up to 88% for long life when powered off batteries (8 AA batteries, not included) and cool operation. Its compact size is at home on any desk. Highlights - Amplifier efficiency of up to 88% - Compact sized amplifier/ receiver - Up to 20 meter (66 ft.) wireless range when used with the Dayton Audio DTA-1W (sold separately) - 3.5 mm local input for smartphone or MP3 connectivity - Battery powered for portable use Dayton Audio DTA-1AR Wireless Class T Digital Mini Amplifier/Receiver 15 WPC Dayton Audio cuts the cord holding your stereo system back with the DTA-1AR wireless mini amplifier receiver. When used wirelessly with the DTA-1T transmitter (included with the Dayton Audio DTA-1W; sold separately), true stereo sound is sent to the DTA-1AR amplifier/receiver via a 2.4 GHz signal while maintaining 20-20,000 Hz (-3 dB) frequency response. Up to 16 additional DTA-1ARs can be used with a single DTA-1T for increasing the size of your wireless system. Built upon the tried-and-true Class T amplifier design, this system exhibits the same high-fidelity audio quality that audiophiles have come to love while remaining compact. The DTA-1AR is also a stand alone amplifier with local 3.5 mm input and is able to run off eight AA batteries (not included) or the included power supply. Rear mounted spring-loaded terminals make speaker connection quick and easy. Includes a 6 in. 3.5 mm coiled male-to-male cable for making connections to iPods, MP3 players, PCs, portable CD or DVD players, and smartphones. Power supply included.