AD-7 is a analog delay effect, max delay time is 1100ms(1.1s), and two modes: 20-600ms, 20-1100ms. this could help to rapidly control the delay time.
|Connectors:||Input×1, Output×1, AC adaptor jack (DC 9 V)|
|Power Supply:||Alkaline battery (9V, 6LR61) or Carbon-zinc battery (9V, 6F22)
AC adaptor (sold separately)