This is the Nix Trainz Power Bridge I 3-wire stay-alive for ESU decoders with 1F of capacitance. It is 13.5mmH x 9.5mmW x 21.5mmL.Nix Trainz Power Bridge I 3-Wire Stay-Alive NTZ-201SKU: NTZ-201$29.00PriceQuantityAdd to Cart