Harman Kardon HK 3770 Stereo receiver with networking and Bluetooth 120 watts x 2 (stereo) into 8 ohms (20-20,000 Hz) at less than 0.07% THD GreenEdge technology combines an energy-efficient, lightweight digital power supply with standard Class AB amplification Internet-ready for listening to music from a networked PC stream music from a DLNA-compatible PC or network-attached storage (NAS) device built-in support for listening to free Internet radio station streams with vTuner built-in Bluetooth for wirelessly streaming music and audio from compatible smartphones, tablets, and computers 24-bit/192kHz digital-to-analog converters free Harman Kardon Remote app lets you use your Apple or Android device as a Wi-Fi remote front-panel USB port for connecting an iPhone, iPad, iPod, or playing music from a thumb drive (WAV, MP3, WMA) does not support Apple Lossless files 6 pairs of RCA stereo inputs, including phono input (MM) digital inputs: 2 optical, 1 coaxial preamp output for a powered subwoofer stereo RCA outputs for recording A/B speaker switching binding post connectors for two pairs of speakers 1/4" headphone jack Ethernet port for network connection AM/FM tuner remote control 17-3/8"W x 5-1/4"H x 12-15/16"D weight: 13.2 lbs.