The Hotone SP-21 Wong Press is a signature 4-in-1 pedal designed in collaboration with guitarist Cory Wong. It functions as a volume, expression, wah, and combined volume/wah pedal. Features include a customized volume control curve, fine-tuned wah Q range, and a dual-color status LED strip indicating current mode and pedal position. The pedal offers an active volume design for lossless tone, classic-voiced wah with flexible tonal range, and separate tuner and expression outputs for versatile connectivity.