The W91580 series dialers are Si-gate CMOS IC tone/pulse switchable dialers containing a 24channel automatic dialing memory, including a 16-digit x 3 emergency dialing memory, a 16-digit x 20 channel repertory memory that provides one-touch and three-touch dialing, and a 32-digit mercury memory. These dialers also provide flash, clear, hold, and one-key redial functions.