In the words of Electro-Harmonix:

The EHX Pico Canyon Echo is Electro-Harmonixs takes the digital delay from the award-winning Canyon Delay and Looper and plates it up as a single serving echo unit. Starting with a crystal clean delay, the Canyon Echo is a sweetly simple delay with 3 seconds of delay time. Dont let the size fool you, this canyon is deep! Add filtering, tap tempo, and a feedback knob capable of infinite repeats and this little echo is up to most time bending tasks.