The Shure SB913A AAA Battery Sled allows three AAA batteries to power your Axient Digital ADX1 or Axient Digital PSM ADXR bodypack. Operation is simple and convenient as the SB913A fits perfectly in the battery compartment of your ADX1 or ADXR bodypack. Use the SB913A as a backup power solution to replace Shure rechargeable batteries as they run down or run completely off AAA batteries; the choice is yours.