The voice changer II features 8 different voice altering settings to choose from and has an easy one step hook up telephone handset. Specifications -Built in amplifier -Comapatible with most telephones including office systems -Compact portable design -2 AA batteries (not included) Size 3 1/2" x 2 3/8" x 7/8" Price: $99.95 S&H: $10.00