The rechargeable battery is very convenient 9 volt I bought two for always being one step ahead to my electric guitar wireless. very convenient to not avcoir cable lying around in the feet but can also serve other even full music products for pedals like WAWA the Flanger and we found it in a short time to depreciate relative to its price a stack of trade which is used only once in 4 recharges the batteries are repaid and after it's all bénèfg ... I urge all users of equipment operating with batteries of 9 volts buy this product because these batteries hold out the load for a long time and it is ecological because it is not seen recycles they have a pretty huge lifetime. Seller quick and neat I recommend
