The KORG Sledgehammer Pro is a clip-on tuner that allows for precise pitch adjustment. I purchased it used and only used it indoors, but I am selling it due to various circumstances. It offers three modes. My favorite was the third mode, the half-strobe mode. - Brand: KORG - Model Name: Sledgehammer Pro - Type: Clip-on tuner - Color: Black Operation confirmed. The outer box and instruction manual are included. The outer box is slightly torn. Thank you.