Multi-Blaster, is a 4 way Speaker System. It is run by 2 Sound Generators, thereby outputting 2 different Bird & Pest control sounds in a 360 degree circle.
The Multi-Blaster can use any two of the many Bird Gard sound units. For example if your problem was Crows and Starlings – You would use the Electronic Scarecrow (ESC) sound module which works well on Crows and the Bird Bat Control (BBC) sound module which works particularly well on Starlings. The combination of both these sounds will effectively repel both species at the same time as well as all the the other pests that are repelled by these sounds modules.