TANDARD SHIPPING IS PRIORITY MAIl SAME DAY SERVICE. The COMBO-2 Compact Colloidal Silver Generator is a combination plug-in and rechargeable-battery-unit (batteries not included), which will also make colloidal silver without the rechargeable batteries installed, if you wish to delay the cost of purchasing them.This 27 volt unit will make 32 oz of 5 ppm colloidal silver in 32 minutes. No need to spend 3 or 4 hours making the same amount of colloidal silver with 9 volt generators. LIFEFORCE DEVICES SOLD OVER 15,000 COLLOIDAL SILVER GENERATORS SINCE 2012, BECAUSE OUR PRODUCTS AND CUSTOMER SERVICE ARE THE BEST VALUE FOR THE MONEY.No need for meters, laser pointers or TDS meters. Included in the package is a fully-tested timing chart, so you can accurately make 5 ppm to 40 ppm colloidal silver. Also included are DETAILED, PHOTOGRAPHIC INSTRUCTIONS.No fumbling with cords and clips to attach to silver wires dangling on the lip of a container: the silver wires are held firmly in the push-button ports. Just install the two 6-inch 14 gauge 9999 pure silver wires in the push button ports, plug it into any 120-volt AC outlet, and you're ready to make colloidal silver.Simply place the battery case on top of a container of distilled water. It automatically turns ON when the silver wires are immersed and turns OFF when they are withdrawn