Designed solely for F5J style competition, the CAMf5j is the easy to use F5J altimeter. NO programming required. NO computer needed. Just plug it in and fly! And, since it comes from Soaring Circuits, you know it's designed, built and supported right here in the USA. The CAMf5j is approved by the FAI for international F5J competition. (US version, that allows motor restart) The CAMf5j features a large, bright, easy to read display and heavy duty 22AWG through-hole soldered leads. The dimensions are 29mm x 21mm x 6.5mm and it weighs 9.5 grams. The CAMf5j may be powered by 3.2 to 8.0 volts.