Used for about 2 years. There are no noticeable scratches or stains. 【Features】 ・Successor to the highly popular iRig interface ・1/4-inch input jack for connecting guitars, basses, electronic instruments, etc. ・1/4-inch output jack for direct connection to an external amplifier ・1/8-inch 4-pole mini-plug for connecting to iPhone, iPad, and iPod touch ・1/8-inch stereo headphone output jack ・Compact and lightweight body ・Switch to switch between FX mode and THRU mode ・Gain control to adjust the input level 【Specifications】 ・Input impedance: 380 kΩ ・Frequency response: 20 Hz ～ 20 kHz (±0.2 dB) ・Instrument input jack: 1/4-inch standard jack ・Amplifier connection jack: 1/4-inch standard jack ・Device connection jack: 1/8-inch TRRS plug ・Headphone output jack: 1/8-inch (mini) stereo jack