Check the listing for details. Technolink TC-450 Mobile RIAA Phono Preamp (with AC adaptor). Condition: New. Listed at 35.50 USD. Welcome to PHONOPREAMPS.COM on TCC TC-450 Mobile Phono Preamp: Battery or AC Operation, Your Choice! The AC adaptor IS included in this listing; to purchase this product with no adaptor included, go HERE. With a 70dB S/N ratio and 0.05% maximum distortion, the new TC-450 introduces the first battery-powered model to our lineup. One nine volt battery will run this low current-draw preamp for many, many hours. Or you can use it with the optional power adaptor, just like our other models. Either way, this preamp (both lightest and smallest of any we sell) adds a new measure of flexibility for those of you recording or listening to your albums on the go. The same sturdy metal construction used in our other models provides excellent shielding, noise rejection and durability. We include free of charge a stereo patch cord (for connection to a receiver or minisystem) and a mini-plug adaptor for use with computers. battery powered; will work anywhere in the world operates on one nine volt battery (not included); easily changed by removing two screwsaccepts (optional) AC adaptor limited lifetime defective exchange warranty RIAA freq response 20hz-20,000hz +/- 0.5dB, S/N ratio >70dBTHD