Signal To Noise Ratio:120 Dimensions (WxHxD):7CM x 4.8CM x 1.65CM WIFI:No Bluetooth:No PCM:Yes DSD (Direct Stream Digital):Yes Operational Amplifier Chips Model:MAX97220 DAC Model:ES9018K2M Channels:2 (2.0) Model Number:M510 Type:Mini Amplifier Recommended Headphone Maximum Impedance:251-300 Ohm Built-in Battery:No Output Type:LINE OUT (AUDIO OUT) Input Type:USB Feature 1:portable headphones amplifier dac Feature 2:usb dac Feature 3:mini amplifier Feature 4:topping Feature 5:hifi amplifier Feature 6:dac audio hi fi Feature 7:dac audio Feature 8:headphone amplifier Feature 9:dac Feature 10:dac amp Feature 11:usb c dac Feature 12:stereo amplifier Feature 13:headphone amp Colour:Black Material:Metal Package Contents: 1 x Headphone decoder 2 x Connecting cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.