Stay away from this mod. What a POS. First off the QC is a joke. The box came with loose screws inside as the chip wasn't properly secured. After working OK for a few days I began to realize that there was no way the wattage readings were accurate. Finally, this morning I swapped out the batteries with freshly charged sony vtc4s, and immediately it began popping and caught fire. I tossed it in the yard and was able to salvage two of the three batteries, but the mod box os now a paperweight. I fully expect fasttech is going to hose me on this. The good news is, my jouse didnt burn down, no one was hurt, and I finally had an excuse to order the sx mini, which should be here in a few days.