Digital Delay PT 80 based on the Princeton delay chip PT2399 with a max. delay time of 400 to 450 ms. Adjustable with time, repeat and Level (original/delayed).Power supply with battery 9V 6F22 or extended DC 9V power supply. Internal doubling voltage from 9 to 12V. Attention! Don't use any power supply with a higher voltage then 9V DC .