You clamp it to your guitars head-stock, turn it on... and it just works! Works by both vibration and microphone. Mine stopped working via vibration. I emailed the awesome people about it at Snark and before I knew it, I had a brand new replacement sent via mail! Love Snark!
It tunes really fast and responsively, battery holds on for a long time, and is reeeeeeally cheap. Doesn't take space in the pedalboard and doesn't interfere with your sound. Wonderful!
One of the best clip tuner at this price point. The red model offers vibration and mic modes. Only issue is that the rubber piece on the grip falls off after some time. I would recommend an updated version of this tuner. Display is much clearer and improvements to the grip