Save you money and save the environment 12 volts lead acid battery desulfator the basic idea behide: Reconditioning a Lead Acid Battery Desulfation (also know as Reconditioning or electrolyte stratification) offers a way for dead batteries to be brought back to life and for tired batteries to be rejuvenated. Desulfation will not bring batteries with a shorted cell, or worn out plates back to their former glory, but it is a valuable tool for anyone depending on battery storage for power who cannot afford to buy new batteries. When lead sulphate crystals build up on the lead plates, it is not an easy task to remove them and thereby recondition the battery. As more and more crystallisation occurs, the voltage required to shift the crystals (dissolving them back into the electrolyte) also increases. But, if you were to put a constant high voltage through the battery it would overheat and could potentially explode. Pulse conditioning is therefore used to ensure that only the sulphate crystals are affected and the battery does not overheat. NOTE: not every battery can be save....you may need to do you own research. Buyer should have some electronics background.. - it can be connected full time on your car battery or any 12 volts system. - the process can takes up to 3 weeks - for more info you can do research on the web. INPUT VOLTAGE 12Vdc OUTPUT VOLTAGE 30V (pk-pk) RATED CURRENT 40mA Average at nominal 12Vdc input. FREQUENCY RANGE 1.50 KHz. Size: W 4, L 8, H 2 mm weight : 50 grams “This device has two leads, one red, one green. The battery should be connected to its charger in the usual manner. The red lead from this device should be attached to the positive chargerbattery connection, and the green lead from this device should be attached to the negative chargerbattery connection. This is what is called connecting the device in parallel with the charger” INSTRUCTION 1.) The desulfator should be installed as close as possible to the battery terminals. (within 14 inches, or 35 cm) 2.) You may trim the wire leads with wire cuttersstrippers to work best for your application. (shorter is better) 3.) Install the Red wire to the positive (+) terminal on your 12 volt battery. 4.) Install the Green wire to the negative(-) terminal on your 12 volt battery. 5.) Verify that the LED is on, you might also be able to hear a “buzzing” noise. 6.) The best results for recovery will occur within the first 4 weeks. If left connected longer, desulfating will continue but at a slower pace. note: This device has two leads, one red, one green. The battery should be connected to its charger in the usual manner. The red lead from this device should be attached to the positive chargerbattery connection, and the green lead from this device should be attached to the negative chargerbattery connection. This is what is called connecting the device in parallel with the charger Strongly recommend pay $2.50 for registered the package with tracking # to make sure you get the item. items are shipped by postal airmail service within the next 24 hours after received payment, not included weekend and holiday. if you dont get the good on timing schedule please fell free to email me. Please before you leave negative feedback or dispute contact me first, I belive we can work thing out.. negative feedback dont help solve problem...thanks. Delivery TimeUSA, Canada ,Australia, West and North Europe 10-15 Business Days, Italy and Other country 25-30 Business DaysShipping addressPlease, make sure to provide us with correct, precise, and detailed shipping Address.Send TimeItems will be shipped within 24 hrs upon payment received or cleared.NoteIf you dont receive items over 20 business days , please notify us.