Owned for just under two years, used only at home to connect my Acoustic and Archtop guitar to my audio interface and get that warm, high end pure clean tone. Pure boost on this is brilliant and putting it in 18V give a massive headroom. Built like a tank, handmade in Austin, Texas and can't fault it's sound.

What is the Fire-Eye Red-Eye Preamp?

From the website: A simple direct-connect solution for Acoustic, Electric and Bass guitar as well as any instrument with a piezoelectric pickup (e.g. violin, ukelele, etc.).

A smooth, natural, balanced, acoustic instrument tone. Low distortion, low noise, and generous headroom mean that clear tone comes through even when an instrument is played percussively and loudly.

Works with 9-18v power, 9v battery (200hrs) or can be used as a passive DI via the FX loop

Made by hand in Austin, Texas

• Input: Impedance-matching, accepts up to 2 volt peak-to-peak level without distortion.
• Low-impedance, balanced, XLR output, 600 ohms with ground-lift switch,
• Boost button with volume control for amplifying solos.
• Treble control to boost or reduce treble. Response is flat when control is centered.
• Usually powered by 48-volt XLR phantom power but has an internal 9-volt battery and a 9 to 18-volt center-negative, center-ground, power jack as alternatives.
• Long 9-volt battery life (~200 hours). Battery is not used if other power is present.
• Plugging an instrument in or connecting external power turns the Red-Eye on.
• Pwr Chk Light illuminates for about a second if power is good when the preamp is powered up. When powered up on the battery, the light will appear if the battery is in thefirst 3⁄4 of its life.
• 1⁄4 inch output and input for effects accessory loop, suitable for stomp-tuners or effects pedals or for output to on-stage guitar amps or PAs.
• Internal filtering to reject radio-frequency interference from neon lights and cell phones.
• Small Chassis Size: 1.25 x 2.25 x 4.25 inches. Weight: 10 ounces.