Check the listing for details. 4V x 140 mA. Mini Solar Panel epoxy encapsulated virtually indestructible .5W. Condition: New. Listed at 2.49 USD. HEART OF THE SUN-SOLAR Sells many items needed to build your own solar panels, solar cells, junction boxes, tabbing wire, buss wire, solder, soldering irons, EVA encapsulation,rosin flux pens, MC-4 connectors, and more. visit my store for a complete list. Not sure what you need send me a question and some details. Brian PAY THE DELIVERY CHARGE ON THE FIRST PANEL, ALL OTHER PANELS YOU BUY SHIP FREE, BUY AS MANY AS YOU WANT. HERE IS THE DISCLAIMER; THIS MEANS ANY PANELS YOU BUY THIS ORDER, NOT PANELS YOU BUY AT A LATER DATE. YEA I HAD SOMEONE THINK THAT. 4 VOLT 140MA. .5 WATT Mini Solar Panel 70mm x 70mm ( 2 3/4" x 2 3/4" ) 2mm thick ( about 3/32 ) made with 16 solar cells wired in a combination of series and parallel to achieve 4 v at 140 ma. virtually indestructible two positive and two negative contact points on the back, soldering is easy you can either solder your leads to the already soldered contact points near the edge or to the copper contact points in the center of the panel. Clearly marked as + and - great for projects, so easy to use and the fact that they are virtually indestructible makes it safe. combine the panels in series to add up your volts to your desired level or wire them in parallel to add up the amps or any combination of series and parallel wiring. I have several other size Mini Solar Panels listed on E bay if you are looking for different volts and different amps. 1v - 300ma 2v - 30 ma 2v - 50 ma 2v - 60 ma 2v - 200 ma 3v - 70 ma 3v - 240 ma 3v - 500 ma 4v - 125 ma 4v - 150 ma 5.5v - 40 ma * 5.5v - 40 ma * *( two different manufacturers with two slight differences in size) 5.5v - 120 ma 5.5v - 1100 ma ( I use this size for portable phone charging) 6v - 140 ma 6v - 160 ma 6v - 200 ma 6v - 250 ma 6v - 330 ma * 6v - 330 ma * *( two different manufacturers with two different sizes) 7.6v - 50 ma ( the only round one I have) 12v - 160 * 12v - 160 * * ( two different manufacturers with two different sizes) 18v - 138 ma