The ZHA-4 splits a single stereo headphone output into four separate powered 1/8˝ headphone jacks, each with their own volume and mute control. Perfect for bands, podcasts, productions, and more. Two AA batteries provide hours of portable power. For longer sessions, connect the USB-C port to a powerbank or plug directly into the wall.Number of Channels: 4Type: Headphone AmpColour: BlackImpedance: 47 OhmInputs: Jack 3.5 mm TRSOutputs: Jack 3,5 mm TRSBattery Operation: YesPower Supply: USB and BatteryBattery Type: AAPlay Time (hours): 3.5Display: NoWidth (cm): 13.0Height (cm): 7.0Depth (cm): 5.2Weight (g): 180.0USB: YesNumber of Preamps: 4Package Contents: USB-C Charging CablePackage Contents: ManualFrequency Range: 10 Hz - 50 kHzControls: VolumeMade in: China.