The Pro-Ject Head Box SE II provides a cost effective solution for headphone listeners whose electronics are without headphone jacks. The Head Box allows connection of two sets of headphones each with its own volume control. Pro-Ject Head Box SE II Technical Data:Power Output: 700mW/30ohms, 110mW/300ohms.Headphone Connection: > 30 ohmsFrequency Response: 20Hz - 20kHz/-0,03dB.Signal To Noise Ratio: 110dB (115dB - A weighted) at full outputTHD (IMD) : 0,003%/30ohms, 0,007%/300ohms.Headphone Jacks: -pole ¼" (6,3mm Ø) phono socket.Output Voltage: 16V/1.000mA AC.Power Consumption: 16V/230mA AC.Dimensions: 103 x 72 x 151mm.Weight: 1.080g without power supply.