This kit is the absolute thing that you’ll need to pull off the phone call pranks or unless you like to change your music. You only get the small board shown, but it offers speaker output with 1.5W at 4 ohms. You also get a line out that will make it easy to hook up to your phone or music equipment.

A 9V battery is all you need to power this handy voice-altering device, which makes it extremely portable.

Cost – $19.95