Audioengine HD4 Wireless Desktop Speakers - Walnut - Frequency Response: 60Hz-22kHz + 1.5dB - Input Impudence: 5K ohms Unbalanced - Amplifier Type: Class AB - Drivers: 4" Aramid Fiber Woofers & 0.75" Silk Dome Tweeters - Wireless Range: Up to 30m typical - Input: 3.5mm Stereo Mini-Jack, USB, RCA L/R, Bluetooth 5.0 - Output: RCA Variable Line-Out, 3.5mm Mini-Jack Headphone Out - Power Output: 120W peak power total (30W RMS/60W peak per channel), AES - 90032910 - 3 Years Limited Warranty

Manufacturer Warranty: 3 Years Limited Warranty

Manufacturer Contact Info: http://audioengineusa.com/,

Effortlessly fill any living space with the power of incredible, true stereo sound that brings your listening experience to life. An all-access pass to ALL of your music on any app or device, the HD4 offers wired or wireless connections including USB input from your computer, Bluetooth aptX-HD from your phone, or good old analog from that vintage turntable or prized tape deck.