A cachon (ka-KHON) is a box (usually made of wood) about knee high. The box has a hole on one side and pieces of wire or tiny springs are fixed loosely against the opposite side of the hole so they can vibrate (inside the box). Then, you sit on the box and beat on the side with the springs on the inside to make rhythmn. The metal pieces on the inside sound like a snare drum and when you hit a portion of the box where the metal pieces AREN'T, it sounds like a bass drum. Very easy to play and a great campfire instrument when accompanied by guitar, harmonica, vocals etc.
person 1: hey man, I'm havin a few people over to have a bonfire and grill tonight, you wanna come?
person 2: sure, I'll bring my cachon and somebody else will bring a guitar, then we can make music!
person 1: sounds great!