All Sendero based GPS products are running the Sendero SDK. This includes the Sendero GPS that runs on the BrailleNote family of products. You can find the version and build number of the SDK by visiting the help menu, SPACE with H on the BT and HELP key on the QT. Scroll to Information Center, press enter. Then scroll to ABOUT and press enter. Chris Grabowski - Customer Support and Product testing Sendero Group "The GPS company." Also, distributors of the mPower, PK, Victor Stream, Voice Sense, Braille Sense, KNFB Mobile Reader, Talks, Miniguide and ID Mate Phone: 888-757-6810 EXT. 113 Email: chris@xxxxxxxxxxxxxxxx