Specifications: transmitter, power two-6v neda no.908 lantern batteries; dim 11.0 in. X 8.0 in. X 7.2 in.; weight 9.3 lb; oper temp m10.0 to p55.0 degrees c; receiver, power four-1.5v "c" cell; dim 5.6 in. X 5.3 in. X 3.3 in.; oper temp m10.0 to p55.0 degrees c