I love this...because I had a 70 Super beetle in college which had this lovely accessory in the rear window "cubby".  I had forgotten all about it.  No, I never had to use it.  The Beetle had been rolled (fugly) and I bought it for 40 bucks.  Drove it for two years and sold it for $300.  Other than my '94 Supra TT; the best return I ever had on an automobile.