We make these up with 3 heavy duty alkaline 9v batteries & supply with 2 ultra fine 99999 (99.999%) pure silver rods .10 gauge (2.4mm) 6 cm long & full instructions for use. Our silver rods are the purest available. Please check the purity of other suppliers - some use silver which is .999 (99.9%) - ours are 100 times more pure - which all means less heavy metals for you!
The batteries should last 1 - 2 years depending on use & It is easy to replace the batteries.
The rods should last 5 - 25 years depending on use.