"Provides added safety required by law in most states. Includes rechargeable 12V battery, rustproof, plastic battery case, LED test light and breakaway switch. For use on single- and tandem-axle trailers with electric brakes. Axles Capable (qty.): 1-2, Brakes Capable (qty.): 2,4, Dimensions L x W x H (in.): 5 3/4 x 5 1/4 x 4 1/2"
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