Phaser, but make it more.... queasy? This has amazing range, both in terms of the depth  of the the effect and the speed, and you can dial the tone/feel of it to your unhinged preferences too. These are discontinued now, but surely a sweet score.

Model: Subdecay Baby Quasar Phase Shifter
Made: USA, recent model
Serial: N/A
Type: phaser
Power Input: standard 9v DC centre-negative (supply not included)
Accessories: none

Condition notes: used, no major marks. Tested and fully functional.
Overall: very good condition (8/10)