I am selling the Firestone Audio "Fireye Mini" headphone amplifier. - Model Name: Fireye Mini - Brand Name: Firestone Audio Co.Ltd. - Color: Red Purchased approximately 5 years ago. I used it once, but haven't had the opportunity to use it since, so I am now selling it. ※ Pets: None ※ Smoking: Non-smoker After using it once, it was stored indoors. I have confirmed that it is working for this sale, but please understand that it is a used item before considering a purchase. Below is information extracted from the product website: ＜Main Specifications＞ Amplifier Structure: Class A/B amplifier Power Supply: Built-in rechargeable lithium-ion battery Headphone Impedance: 32Ω～600Ω Continuous Playback Time: Approximately 12 hours (Fireye Mini) or approximately 24 hours (Fireye1) ※ When fully charged Charging Time: Approximately 3 hours (Fireye Mini), via USB Main OP Amp: TI-DRV601 THD (Total Harmonic Distortion): 0.00068% S/N Ratio (Signal-to-Noise Ratio): -100.5dB (A-Weighted) ※ Fireye1 figures Dynamic Range: 99.5dB (A-Weighted) ※ Fireye1 figures Frequency Response: 40Hz +0.03dB, 15kHz -0.62dB (between 40Hz and 15kHz) ※ Fireye1 figures Input Terminals: 3.5mm mini jack (line input) ×1 Output Terminals: 3.5mm mini jack (headphone output) ×1 Charging Terminals: Mini USB jack ×1 Dimensions: Approximately 40mm x 24mm x 9mm (depth x width x height) Weight: Approximately 14g