djreef, there are but they cost a wee bit more. I have three Tripplite Voltage rgeulators and yeah that clicking noise can get annoying and there is no way of silencing it. I bought two Monster AVS 2000 Signatures when they were on closeout from Circuit City at 299.00 (retail is 1699.00) somebody screwed up royally on that one but hey I profited. Althugh I feel Monster doesnt do anything different than Tripplite, the difference is the Monster puts out a constant 120 volts where the Tripplite only engages if the voltage drops below 112 or goes higher than 127. The other thing is the Monster never makes a single sound ever. Although I dispise Monster for the business practices, I also know a good deal when I see one, hence the only reason I bought those two AVS2000's But yes do a search and you should find some units that don't make that clicking noise.