How to determine which lens to use for the DS915.

[#1]

                                  Standard Coverage using the lens provided:

1. 30 ft. by 38 ft.

                                  Alternate lenses for optional Coverage:

1. Barrier ( OLB91-3 ) 30 ft. by 4.8 ft.
2. Long range (OLP91-3) 60 ft. by 9.5 ft.
3. Pet (OLR91-3) 30 ft. by 38 ft.
4. Dense wide angle (OLW91-3) 30 ft. by 50 ft.
5. Dual Corridor (OLC91-3) 60 ft. barriers and 30 ft. by 30 ft. center coverage

   They are shipped in packages of three.