Photovoltaic DC string box, factory assembled by Eaton: IEC 61439-2 Annex-DD. For inverters with 2 MPP trackers: 2x IN + 2x OUT, integrated devices: PV surge protection device type 1+2, MC4 connections on the bottom of the box, IKA box 1-row with 8 pitch units and transparent window, for outdoor installation without direct sunlight. For safe operation, please note the min. and max. permissible ambient air temperature in the technical data sheet