Solar powered energizer has low impedance technology with modular circuitry for fast and easy service. Ideal for use in remote areas where electrical power source is not available. All-weather construction, peak joule output under the most difficult fence conditions, built-in lightning protection. Energy efficient and environmentally friendly solar unit includes an installed battery. Designed and assembled in U.S.A. No. DS 20: Coverage Area: Up To 3 Acres, Voltage: 6V, Energy Output: 0.06 Joules, Energy Input Type: Solar, Shell Material: Polyac-Black, Dimensions: 11" x 9" x 11", Weight: 5 lb, Pkg Qty: 1, Package Type: Box No. DS40: Coverage Area: Up To 40 Acres, Voltage: 12V, Energy Output: 0.1 Joules, Energy Input Type: Solar, Shell Material: Polyac-Black, Dimensions: 12-1/2" x 6" x 15", Weight: 11 lb, Pkg Qty: 1, Package Type: Box No. DS100: Coverage Area: Up To 100 Acres, Voltage: 12V, Energy Output: 0.25 Joules, Energy Input Type: Solar, Shell Material: Polyac-Black, Dimensions: 17-1/2" x 17-1/2" x 6", Weight: 11 lb, Pkg Qty: 1, Package Type: Box