FOXPRO's "large" SP108SC high volume external speaker for the FOXPRO Snow Crow Pro. Adding additional speakers offers better sound coverage and EXTREME VOLUME. The SP108SC External Speaker is for the FOXPRO Snow Crow Pro ONLY (this speaker has a special connector for use with the Snow Crow Pro). Note: Electronic Caller is NOT included - one optional Speaker only. The Snow Crow Pro is capable of powering 2 optional speakers for a total of 4 speakers as pictured.