Check the listing for details. Matrix SR-1000 Quartz Guitar Tuner, 1/4" Input & Output, Built In Mic, 9 Volt. Color: Black, Condition: Used. Listed at 11.99 USD. This Matrix SR-1000 Guitar Tuner is a must-have for guitar enthusiasts. It features a 1/4" input and output, built-in mic, and runs on a 9-volt battery. The black color and compact design make it a great accessory to add to your musical instrument collection. With its advanced technology, this tuner is perfect for all types of guitarists, whether you're a beginner or an experienced player. Its easy-to-use interface and accurate tuning capabilities make it a reliable tool for tuning your guitar. So, add this Matrix SR-1000 Quartz Guitar Tuner to your collection and take your music to the next level!