This is a holder for the 6v solar panels sold at most Radio Shacks. It has holes and slots for easy screw and strap mounting. The slots along the sides are good for most backpack straps. Made for 13.2 cm x 8.7 cm (or smaller!) panels. A bit of 3M double sided tape will keep the panel in place. I am thinking about creating a cellphone/arduino mounting system for charging and whatnot. Printed on a Dimension Systems 3d printer... Sorry no Silc3r settings!