Purchased new at the end of December and used once for testing. Selling to someone who can use it, as it doesn't suit my usage environment. Excerpt below: "Polar Go," an all-in-one portable audio solution for creators who are particular about sound. With a built-in rechargeable battery, it can be used for up to 4 hours. You can start creating immediately by simply connecting it to your smartphone. It's a fully mobile audio solution that seamlessly integrates with iOS, Android, macOS, and Windows, featuring an XLR/instrument input combo jack, +48V phantom power, and dual USB-C ports (for charging and data transfer). Detailed Information Number of built-in microphones: 2 ProCapture microphones Number of microphone preamps: 1 Phantom power: Yes / 48V Line input: 1 Headset input: 1 Headphone output: 1 Loopback: Yes Connectivity: USB Type-C *Please connect Polar Go to your mobile device with the included USB-C cable. Headphone Output Frequency Response: 20-20kHz ±0.07dB @ 33Ω / 300Ω Dynamic Range: 105dB @ 33Ω for 0dBFS 105dB @ 300Ω for 0dBFS THD + N: -95dB @ 33Ω for 0dBFS -95dB @ 300Ω for 0dBFS Maximum Output Level: 10.2dBu (2.507Vrms) 33Ω 12.2dBu (3.156Vrms) into 300Ω for 0dBFS Maximum Output: 160mW into 33Ω 33mW into 300Ω for 0dBFS Impedance: 10Ω Mems Microphone Sensitivity: 1 kHz, 94 dB SPL -37 dB FS ±1 dB Acoustic Dynamic Range: 107 dB Dynamic Range: 107dB THD + N: 0.15% (-56.47dBu) @ 94 dB SPL Acoustic Overload Point: 133 dB SPL Box: Yes Instruction manual: Yes