The Pro Plus system features solid-state electronics mounted inside a NEMA rated control box that is suitable for most any weather condition. Features include enhanced random operation for sound frequency and a user-replaceable EPROM recording chip that can now be easily changed in the field in order to use different recorded sounds. The unit features two built-in amplifiers and 2 external speakers, for high-volume, crystal-clear digital sound output. The generating unit mounts easily to a post or pole using the included mounting hardware and bracket. The two speakers with cable allow many diverse sound coverage patterns, including long narrow applications. The unit comes pre-recorded in many different configurations. Four of the most common configurations are: agricultural (chip#1), marine (chip#2), crow/raven (chip#7) or woodpecker (chip#11).