Brand Name: TOPPING Built-in Battery: No Recommended Headphone Maximum Impedance: 32-50 Ohm Output Type: LINE OUT (AUDIO OUT) Origin: CN(Origin) Input Type: LINE IN (AUDIO IN) Input Type: RCA Body Material: Aluminum Package: Yes Channels: 2 (2.0) Dimensions (WxHxD): 11.3*12.3*2.6cm Model Number: Topping A50s Signal To Noise Ratio: 143dB Bluetooth: No Type: Mini Amplifier WIFI: No