In the words of EarthQuaker Devices:

Built upon the same proprietary DSP architecture as the smash-hit Avalanche Run, Pyramids is a Stereo Flanging Device with five user-definable presets (a first for any EarthQuaker Devices pedal!), eight flanger modes, tap tempo, tap subdivision via the Rate & Tap mini-toggle, a multifunction Modify control, positive and negative feedback, and a variable Mix control, which is something you dont see on a flanger every day.

Pyramids Activate footswitch features EarthQuaker Devices exclusive Flexi-Switch technology. This relay-based true-bypass switching platform allows for momentary or latching operation, making it easier than ever to engage the effect to bedazzle individual notes or phrases! For standard latching operation, tap the footswitch to activate the effect and tap again to bypass. For momentary operation, simply hold down the footswitch for as long as youd like to use the effect.