Brand Name: TIANCOOLKEI Built-in Battery: No Recommended Headphone Maximum Impedance: 251-300 Ohm Output Type: LINE OUT (AUDIO OUT) Origin: CN(Origin) Input Type: RCA Input Type: LINE IN (AUDIO IN) DSD (Direct Stream Digital): No Body Material: Aluminum Package: YES Channels: 2 (2.0) Output Power: 400mW Model Number: HD650 PCM: No Bluetooth: No Type: Home Amplifier WIFI: No