Built-in Battery: No Recommended Headphone Maximum Impedance: 101-150 Ohm Output Type: LINE OUT (AUDIO OUT) Origin: CN(Origin) Input Type: RCA DSD (Direct Stream Digital): No Body Material: Aluminum Package: YES Channels: 2 (2.0) Dimensions (WxHxD): 105*73*31 mm Model Number: Sabaj PHA3 Operational Amplifier Chips Model: NJM4556D Signal To Noise Ratio: 95 PCM: No Bluetooth: No Type: Mini Amplifier WIFI: No Input Interface: RCA/3.5 mm Stereo Jack THD+N: 0.032% SNR: 95dB Consumption Power: 5.5W Frequency Response: 20Hz-20kHz Residual Noise: 0.02mV Output Interface: 3.5 mm headphone jack