Quoted from Grg:Most appliances now days I own, shaver, phone charger etc can use either 110-240v 50/60hz no problems.
Our products use off the shelf switching supplies, which are rated 90-264 VAC, with a frequency range of 47-63HZ. The customer just installs a plug adapter we provide if shipping outside the US. To me, it seems weird to even bother to list the frequency on the DMD at all, unless it's tied to detecting imports.