Versatile Connectivity, Featuring USB input and output, it seamlessly connects your Android or IOS devices for enhanced audio experienc Portable Design: The for JM7MAX is a compact, portable amplifier, perfect for on-the-go audio enthusiasts Digital CX31993 Adapter Equipped with a CX31993 adapter, it delivers high-fidelity sound quality for audiophile Optimized for Headphones With a recommended maximum impedance of 251-300 Ohm, it ensures optimal performance with a wide range of headphones High-Quality Materials Crafted from high-grade aluminum, this mini amplifier offers durability and sleek aesthetics Model Number:JM7MAX Item Type:Visual HiFiPortable Amplifier Chip:CX31993 OPAMP Chip:SGM8262 PCM:32bits/384KHz Output Power: about 228mW(16Ω/+N Less than 1) about 118mW(32Ω/+N Less than 1) about 13mW (300Ω/+N Less than 1) SNR: about 115dB(32Ω,A-.) Corsstalk: about -76dB(32Ω) DNR: about 103dB -N: about 0.0025%(32) about 0.0025%(300) (The product printed words depending on the batch, but this does not affect use) Color:As Shown Material:plastic Package Contents: 1 * CX31993 Adapter 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.