ZOS Wine Preserver Spare Cartridges, Set of 2

A built-in computer chip in the ZOS wine preserver automatically runs a series of checks on the cartridge every time you take it from its airtight holder, flashing lights from red to green as it does so. When the light turns green it’s ready to pop into the bottle, an initial violet light flashes to let you know it’s doing its job, and a constant red light means it’s time for a new cartridge. Each cartridge preserves up to 15 bottles of wine or 90 glasses. (This represents excellent value as an average bottle of wine in the UK is £5.99, therefore the cost to preserve one bottle would be less than 40p)