I just bought Schick Quattro Titanium Trimmer. I got it from target for about $10. I also bought a six pack of blades(came with 2 for free 8 total) for about $10 also. The trimmer has 3 length settings. The trimmer trims very short though. Even on the highest level it left my face with just over stubble. I would recommend it if you don't mind that. One AAA battery included. 100% shower safe and very easy to clean.
