RLC-1 Plus Expansion Board adds: The RLC-1 can be upgraded to the RLC-1 Plus, or can be purchased with the update already installed. The RLC-1 Plus is an expanded version of the RLC-1 that makes it a powerful, voice based controller with 70 macros, a clock/scheduler, HF remote base control and more. Existing RLC-1 controllers can be upgraded in the field. RLC-1 Features Flexible Dual-port design ensures repeater & link system flexibility Controller CW informs you of the conditions at your site DTMF commands can be entered from either port Multiple ports allow your controller to handle your growing system Cost Effective Low power consumption reduces battery and overall system costs Controls up to two repeaters or links with only one RLC-1 controller, reducing system costs Modular connector design lowers set-up time & decreases system down time Durable High quality construction guarantees years of trouble-free operation Made in the U.S.A. Handling cost built into the price.