Tolako USBasp AVR Programmer Downloader for ATMEL Proccessors Works under multiple platforms. Linux, Mac OS X and Windows are tested. No special controllers or smd components are needed. No 64K program limits!Perfect support WIN7 64-bit Support S51 and AVR chips, faster than the parallel port ISP, more stable; best choice for notebook, computers which withoutparallel port . (S51 series can not beburnedand downloadedwith 3.3v). Plug and play, no need to install any drivers