looking at this pre/amp

While my Sony processor does it's job I'm still looking for just a stand alone pre/amp with no built in tuner but I do need tuner in, or aux, cd and phono. The one I'm looking at has all the inputs I need and the seller says it's the 100v model. Is this a concern. I can't really see the plug end but it's certainly not a 220v unit and when seen from the rear the a.c.outlets are U.S. type. Is this ready for home use and why denote it as 100v which it does say on the back and on the spec sheet at the bottom...


http://www.ebay.com/itm/Yamaha-C-50-2-Channel-Stereo-Pre-Amplifier-/301756386959?
2chl- Adcom GFA- 555-Onkyo P-3150v pre/amp- JVC-QL-A200 tt- Denon 1940 ci cdp- Adcom GFS-6 -Modded '87 SDA 2Bs - Dynamat Ext.- BH-5- X-Overs VR-3, RDO-194 tweeters, Larry's Rings, Speakon/Neutrik I/C- Cherry stain tops Advent Maestros,Ohm model E

H/T- Toshiba au40" flat- Yamaha RX- V665 avr- YSD-11 Dock- I-Pod- Klipsch #400HD Speaker set-

Bdrm- Nikko 6065 receiver- JBL -G-200s--Pioneer 305 headphones--Sony CE375-5 disc