Standard impedance: main box (20HM) satellite box (40HM)Distortion: 0.3%<1W/1KHZSignal to noise ratio:> 80DBOutput power: 3W*2 +5WPower supply: USB/DC 5VCable length: 1.2 metersAccessories include: host *1 manual *1 charging cable *1Product features: support to connect to mobile phones, laptops, ipads, desktop computers, etc.Applicable products: Available with 3.5MM audio interface