The decoder has been tested to ensure it’s fully working before listing. Serial no. FA0DE7AD Firmware version 5.10.166 (29/04/24) CV1 Address: 3 To best of my knowledge this is an unused decoder as it still has the ESU Diesel test sound file loaded and a factory fitted speaker attached plus included kit to make up the resonance chamber for the speaker. No original packaging included. The uploaded photos, along with the above text form the description for this listing. Happy to answer any questions, but unsolicited offers will be ignored. Will be well packaged for posting and sent via Royal Mail tracked delivery. Offered for sale to UK based buyers only.