Jodi-Vac Consumer Hearing Aid Vacuum Cleaner consists of vacuum which is 15 inches of Mercury;Internals operate on 12VDC and power Supply is desktop style of 120/240Vac, 50/60Hz, Dimensions: 4.5 x 7.25 x 3;Filter is replaceable, non-serviceable;Wax collects in filter;Ball located behind filter is a flow indicator