Tektrum 40w 40 watt High-Efficiency Mono-crystalline Solar Panel Battery Charger Maintainer Kit/Blocking Diode Cable/2m long Cable and Clamps for RV, Home, Boat, Pool Made of monocrystalline PV -- the most energy efficient material; CE certified; An extra 2m long cable with clamps provides the easy connection to batteries or electronic devices Dimension 26.3inx22.6inx1.57in (668x575x40mm); Maximum Power (Pmax) 40Watts Maximum Power Voltage (Vmp) 17.5V; Maximum Power Current (Imp) 2.29A; Open Circuit Voltage (Voc) 21.5V Short Circuit Current (Isc) 2.58A; An extra blocking diode cable prevents reverse current flow.