This is a compact, Klon style overdrive pedal.

Description from Sweetwater:

When you push the overdrive envelope, you don't just want that screech and howl. You also want to retain the warmth and range of your tone. With the Zeus Drive overdrive pedal, you can growl while staying grounded in warm tone with an outstanding dynamic response. The Zeus features an all-analog circuit and a stepped-up internal voltage that work in tandem to not only boost your output, but also keep that sonic variety of your tone intact. When you want to boost your low end, a Fat mod switch makes it easy. Easily blend distortion with your clean signal via a dual concentric Gain control for truly amp-like tones. The Zeus also features a Treble control that lets you elevate your highs without watering down your bass response. Guitarists here at Sweetwater have put the Zeus Drive through the paces and are amazed at the results — just wait until you hear this pedal for yourself!